iMac will not start

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My iMac has been running very slowly & today a dark "shade" came down and Fire fox crashed. Then a multi-language message window came up on the screen stating "restart the computer" but, when I do, it just goes black & same "restart" message comes up.
 

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Start your iMac in Safe Boot mode and copy the last kernel panic log to your next post to let us have a look at what it says. To start in safe mode:

Press and hold your Shift key as soon as you hear the startup sound. Hold it until the Apple appears. Safe mode disables all third party drivers, startup apps and the system sound. It also does a verify on your hard drive.
 
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I started "test" & the sent the report from panic log to Apple. I tried to copy to include with this but could not. Can you get to that reply?
I then selected start iMac and opened Safari & am replying from the iMac. Will see what happens when I try to go to normal ops now.
 
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Silver M1 iMac 512/16/8/8 macOS 11.6
When you next have a kernel panic go into Console and copy the log here. Generally KPs are hardware related. Any new memory or hardware? In case it may be software, using MacKeeper or any antivirus software by chance?
 
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Interval Since Last Panic Report: 2579 sec
Panics Since Last Report: 1
Anonymous UUID: 554C1F33-D25B-4C17-8D3B-B799BEDBA0BA

Sat Apr 13 20:59:04 2013
panic(cpu 1 caller 0x2ceabf): Kernel trap at 0x4ac188b6, type 14=page fault, registers:
CR0: 0x8001003b, CR2: 0xb21ae6c3, CR3: 0x00100000, CR4: 0x00000660
EAX: 0x4bc48000, EBX: 0x0914f004, ECX: 0x088af050, EDX: 0x665666c3
CR2: 0xb21ae6c3, EBP: 0x4a0f3518, ESI: 0x00000000, EDI: 0x665666c3
EFL: 0x00010246, EIP: 0x4ac188b6, CS: 0x00000008, DS: 0x00000010
Error code: 0x00000002

Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x4a0f3378 : 0x2203de (0x6b08cc 0x4a0f3398 0x229fb0 0x0)
0x4a0f33a8 : 0x2ceabf (0x6bd9e0 0x4ac188b6 0xe 0x6bd989)
0x4a0f3458 : 0x2e5564 (0x4a0f3480 0x4a0f3468 0x4a0f3478 0x4ad1976d)
0x4a0f3478 : 0x4ac188b6 (0xe 0x48 0x4a0f0010 0x4ad10010)
0x4a0f3518 : 0x4ad1b2b7 (0x88af004 0x700c004 0x665666c3 0x50)
0x4a0f3558 : 0x4ac8bb58 (0x700c004 0x665666c3 0x50 0x0)
0x4a0f3598 : 0x4ac8eb6a (0x700c004 0x4a0f3600 0x0 0x0)
0x4a0f3638 : 0x4ac90654 (0x700c004 0x4 0x0 0x0)
0x4a0f3698 : 0x4ac93093 (0x4a0f3718 0xd1a4 0x4a0f38b0 0x0)
0x4a0f3908 : 0x4ad6dc13 (0x700c004 0x0 0x36715090 0x0)
0x4a0f39e8 : 0x4ad6f8b2 (0x700c004 0x36715004 0x0 0x0)
0x4a0f3ac8 : 0x4ad17102 (0x700c004 0x36715004 0x0 0x0)
0x4a0f3b08 : 0x4ac1d000 (0x700c004 0x2c6a 0x1 0x0)
0x4a0f3b48 : 0x4ac1f902 (0x700c004 0x3 0x0 0x0)
0x4a0f3ce8 : 0x4abb89e1 (0x0 0x881b10 0xfffe0001 0x54c48000)
0x4a0f3d38 : 0x4abb8f92 (0x9243000 0x7220f00 0x0 0x4)
0x4a0f3d78 : 0x4abb9117 (0x9243000 0x922f900 0x1 0x1)
0x4a0f3da8 : 0x4a7e41eb (0x9243000 0x4a7e8094 0x91cdaa0 0x70fef10)
0x4a0f3df8 : 0x4a7e2882 (0x9243000 0x0 0x5 0x9243000)
0x4a0f3e18 : 0x64aca7 (0x9243000 0x88b3d80 0x88b3d80 0x0)
0x4a0f3e48 : 0x681efe (0x9243000 0x88b3d80 0x88b3d80 0x0)
0x4a0f3e88 : 0x2ac4a6 (0x9243000 0x88b3d80 0x0 0x0)
0x4a0f3ed8 : 0x222db6 (0x7c33068 0x8e08984 0x1 0x4a0f3f34)
0x4a0f3f08 : 0x214063 (0x7c33000 0xffe00000 0x1 0x2)
0x4a0f3f48 : 0x21b25b (0x7c33000 0x0 0x0 0x0)
0x4a0f3f98 : 0x2b7bb7 (0x7fe81d4 0x7fff 0x7fe8204 0x8)
0x4a0f3fc8 : 0x2e60c7 (0x7fe81d0 0x0 0x10 0x7fe81d0)
Kernel Extensions in backtrace:
com.apple.iokit.IOGraphicsFamily(2.3.4)[EE3F8FBE-3457-4F0E-A3A3-B9B1A44DCF6B]@0x4a7cc000->0x4a7fffff
dependency: com.apple.iokit.IOPCIFamily(2.7)[8087C029-833E-4B62-A8C3-2B074B4C55F7]@0x4311c000
com.apple.NVDAResman.G7xxx(7.0.4)[6581C9F3-3221-4530-BEB4-627CB8D602AE]@0x4abb5000->0x4aeaafff
dependency: com.apple.iokit.IOPCIFamily(2.7)[8087C029-833E-4B62-A8C3-2B074B4C55F7]@0x4311c000
dependency: com.apple.iokit.IONDRVSupport(2.3.4)[393829BA-614C-4ED7-B4AD-CE577A41C683]@0x4a766000
dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[EE3F8FBE-3457-4F0E-A3A3-B9B1A44DCF6B]@0x4a7cc000

BSD process name corresponding to current thread: WindowServer
Boot args: -x

Mac OS version:
11G63

Kernel version:
Darwin Kernel Version 11.4.2: Thu Aug 23 16:26:45 PDT 2012; root:xnu-1699.32.7~1/RELEASE_I386
Kernel UUID: 859B45FB-14BB-35ED-B823-08393C63E13B
System model name: iMac6,1 (Mac-F4218FC8)

System uptime in nanoseconds: 202611495151
last loaded kext at 197261364803: com.apple.filesystems.autofs 3.0 (addr 0x4309c000, size 45056)
loaded kexts:
com.seagate.driver.PowSecDriverCore 5.0.1
com.apple.filesystems.autofs 3.0
com.apple.driver.AppleMuxControl 3.1.33
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleBacklight 170.2.2
com.apple.driver.ApplePolicyControl 3.1.33
com.apple.driver.ACPI_SMC_PlatformPlugin 5.0.0d8
com.apple.driver.AppleLPC 1.6.0
com.apple.driver.AppleBluetoothMultitouch 70.12
com.apple.driver.CSRUSBBluetoothHCIController 4.0.8f17
com.apple.driver.AppleIRController 312
com.apple.driver.CSRHIDTransitionDriver 4.0.8f17
com.apple.iokit.SCSITaskUserClient 3.2.1
com.apple.driver.USBCameraFirmwareLoader 1.1.0
com.apple.driver.XsanFilter 404
com.apple.BootCache 33
com.apple.iokit.IOAHCIBlockStorage 2.1.0
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.driver.AppleUSBHub 5.1.0
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.driver.AppleAHCIPort 2.3.1
com.apple.driver.AppleFWOHCI 4.9.0
com.apple.driver.AirPortBrcm43224 501.36.15
com.apple.iokit.AppleYukon2 3.2.2b1
com.apple.driver.AppleEFINVRAM 1.6.1
com.apple.driver.AppleIntelPIIXATA 2.5.1
com.apple.driver.AppleUSBEHCI 5.1.0
com.apple.driver.AppleUSBUHCI 5.1.0
com.apple.driver.AppleRTC 1.5
com.apple.driver.AppleHPET 1.7
com.apple.driver.AppleACPIButtons 1.5
com.apple.driver.AppleSMBIOS 1.9
com.apple.driver.AppleACPIEC 1.5
com.apple.driver.AppleAPIC 1.6
com.apple.driver.AppleIntelCPUPowerManagementClient 195.0.0
com.apple.security.TMSafetyNet 8
com.apple.security.quarantine 1.4
com.apple.nke.applicationfirewall 3.2.30
com.apple.driver.AppleIntelCPUPowerManagement 195.0.0
com.apple.kext.triggers 1.0
com.apple.nvidia.nv50hal 7.3.2
com.apple.nvidia.nvGK100hal 7.3.2
com.apple.driver.AppleBacklightExpert 1.0.4
com.apple.nvidia.nvGF100hal 7.3.2
com.apple.NVDAResman 7.3.2
com.apple.driver.AppleGraphicsControl 3.1.33
com.apple.driver.AppleSMC 3.1.3d10
com.apple.driver.IOPlatformPluginLegacy 5.0.0d8
com.apple.driver.IOPlatformPluginFamily 5.1.1d6
com.apple.nvidia.nv40hal.G7xxx 7.0.4
com.apple.NVDAResman.G7xxx 7.0.4
com.apple.iokit.IONDRVSupport 2.3.4
com.apple.iokit.IOGraphicsFamily 2.3.4
com.apple.driver.IOBluetoothHIDDriver 4.0.8f17
com.apple.driver.AppleMultitouchDriver 231.4
com.apple.driver.AppleUSBBluetoothHCIController 4.0.8f17
com.apple.iokit.IOBluetoothFamily 4.0.8f17
com.apple.driver.AppleUSBHIDMouse 175.9
com.apple.driver.AppleHIDMouse 175.9
com.apple.driver.AppleFileSystemDriver 13
com.apple.iokit.IOUSBHIDDriver 5.0.0
com.apple.driver.AppleUSBMergeNub 5.1.0
com.apple.driver.AppleUSBComposite 5.0.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice 3.2.1
com.apple.iokit.IOBDStorageFamily 1.7
com.apple.iokit.IODVDStorageFamily 1.7.1
com.apple.iokit.IOCDStorageFamily 1.7.1
com.apple.iokit.IOSCSIBlockCommandsDevice 3.2.1
com.apple.iokit.IOFireWireSerialBusProtocolTransport 2.1.0
com.apple.iokit.IOFireWireSBP2 4.2.0
com.apple.iokit.IOATAPIProtocolTransport 3.0.0
com.apple.iokit.IOSCSIArchitectureModelFamily 3.2.1
com.apple.iokit.IOUSBUserClient 5.0.0
com.apple.iokit.IOAHCIFamily 2.0.8
com.apple.iokit.IOFireWireFamily 4.4.8
com.apple.iokit.IO80211Family 420.3
com.apple.iokit.IONetworkingFamily 2.1
com.apple.iokit.IOATAFamily 2.5.1
com.apple.iokit.IOUSBFamily 5.1.0
com.apple.driver.AppleEFIRuntime 1.6.1
com.apple.iokit.IOHIDFamily 1.7.1
com.apple.iokit.IOSMBusFamily 1.1
com.apple.security.sandbox 177.9
com.apple.kext.AppleMatch 1.0.0d1
com.apple.driver.DiskImages 331.7
com.apple.iokit.IOStorageFamily 1.7.2
com.apple.driver.AppleKeyStore 28.18
com.apple.driver.AppleACPIPlatform 1.5
com.apple.iokit.IOPCIFamily 2.7
com.apple.iokit.IOACPIFamily 1.4
Model: iMac6,1, BootROM IM61.0093.B07, 2 processors, Intel Core 2 Duo, 2.16 GHz, 4 GB, SMC 1.10f3
Graphics: NVIDIA GeForce 7300 GT, NVIDIA GeForce 7300 GT, PCIe, 128 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR2 SDRAM, 667 MHz, 0x0000000000000000, 0x128866703132355336344350382D59352020
Memory Module: BANK 1/DIMM1, 2 GB, DDR2 SDRAM, 667 MHz, 0x0000000000000000, 0x128866703132355336344350382D59352020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x87), Broadcom BCM43xx 1.0 (5.10.131.36.15)
Bluetooth: Version 4.0.8f17, 2 service, 18 devices, 0 incoming serial ports
Network Service: AirPort, AirPort, en1
Network Service: Built-in Ethernet, Ethernet, en0
Serial ATA Device: ST3250824AS Q, 250.06 GB
Parallel ATA Device: MATSHITADVD-R UJ-85J
USB Device: Built-in iSight, apple_vendor_id, 0x8501, 0xfd400000 / 2
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8206, 0x7d100000 / 3
USB Device: IR Receiver, apple_vendor_id, 0x8240, 0x7d200000 / 2
USB Device: composite_device, 0x04f9 (Brother International Corporation), 0x01e5, 0x5d100000 / 2
USB Device: Hub in Apple Extended USB Keyboard, apple_vendor_id, 0x1003, 0x3d100000 / 2
USB Device: Apple Optical USB Mouse, apple_vendor_id, 0x0304, 0x3d120000 / 4
USB Device: Apple Extended USB Keyboard, apple_vendor_id, 0x020b, 0x3d130000 / 3
 
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chas_m

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I am not the expert I was once on this, but it looks to me like an issue with the video card.
 
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A correction /addition to my original complaint / cry for help: For some reason I did not remember earlier that an Adobe Flash Player "down-load required" alert box came up & the download had begun just before the dark screen came down. It appeared authentic and I thought nothing of it then but that may have been a malware download.... Hope it's been a nice weekend for you all!
Jim
 
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iMac wo'n't start. Thread

I am not the expert I was once on this, but it looks to me like an issue with the video card.

chas_m,
No one has responded to my posts so I reviewed the 2 I got & read your advise, Excellent & I am sure I should have been running some maintenance & virus software but have never had any problems with any Macs I've had. But, I have something amiss.
I am responding to your response via the iMac in "Safe Mode" & video is perfect. Everything works fine as long as I stick with the Mac software. But, as soon as I try to restart normally, the grey curtain drops & restart is ordered.
I live in S. Carolina hours away from an Apple store or repair shop for Apples. So, would appreciate any advise on fixing this fine iMac.
Thanks, Jim
 

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If your iMac is operating OK in safe mode then that means the video is working correctly. And it's not likely to be a hardware problem. Also, I don't believe you have malware. The Adobe Flash update should be OK.

Take a look at your startup apps to see what might be running when you're in normal mode. Here's how:

1. System Preferences - Users & Groups (or Accounts), click on the "Login Items" tab. That will show what apps are running on startup. You can remove them by pressing the minus button below after highlighting them. (You first must open the small lock with your admin password.)

2. Open the Finder. Navigate your way here:

Macintosh HD/Library/StartupItems/

Macintosh HD/System/Library/StartupItems/

If there are any apps in the above two folders, don't delete them. Let us know what they are first.
 
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Silver M1 iMac 512/16/8/8 macOS 11.6
Have you by chance installed MacKeeper or any antivirus software at all?
 
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IMac wo'n't start. Thread

Response to Harry: No antivirus s/w at all. I will when I get this one back operational.
I will now try to restart in Normal Mode to check on apps running in background---has not started in normal mode so for days, so don't have much hope. But, will report back.
Jim
 
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chscag,
The iMac did start up with a "restart" from the Safe mode & I checked Systems Preferences /Users& Groups and it shows that I am active and "Guest User" is "Sharing Only" --I have no idea who/what that is or could be.
Under Log-in items I found 2 apps checked to run on log-in: Eye-TV (I used that years ago & so deleted it & "DevDetectListener" which I do not know anything about so left it alone.
I then tried to navigate in the Finder to find the Library or Start- up Items & could not navigate to either. So, I checked the "Activity Monitor" & found one possible problem: it showed the "X11" app had been modified at about the time the iMac crashed (10 Apr, 3:38PM). It has 5.4MB but I could not tell anything else about it. I am writing this still in normal mode but the windows started fragmenting and it is really unusable now, So, will post this for your analysis. Sorry I could not figure out how to dig deeper into the OS. BTW what anti-virus and other maintenance programs do you recommend for iMacs, Powerbooks & iPads?
Thanks! Jim
 

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You can remove the "DevDetectListener" as that should not impact anything you're running.

The X11 app is used to run certain programs and will not be active until the program is called up. (WINE uses X11 to run some Windows programs.)

BTW what anti-virus and other maintenance programs do you recommend for iMacs, Powerbooks & iPads?

You don't need to run an Anti-Virus program and the only maintenance program we recommend is OnyX which you can download from here. Make sure you download the correct version for your version of OS X.

I don't know of anything for the iPad and really don't think you need anything for it anyway.
 
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CHSCAG, Thank you for your expert advise. I downloaded (& contributed) OnyXX & ran all the tools in it and my iMac now runs OK--most of the time. Video "hangs up" occasionally & frames are partially displayed or in random rectangular segments.
Sorry for the tardy thank-you note but went to France on vacation the day after getting it back running & used it for final coordination of the trip & had such a great time that when came home I spent a week in the hospital for a pacemaker installation.
 

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You're welcome. And I hope the Pacemaker keeps your heart in good rhythm for many years to come. :)
 
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Safe mode restart will not work now

CDG, thnx for your wishes but, yesterday it would not load new pages & I tried to run Oxy again but could not Start it either so I thought I'd go back in safe mode & run it.
Could not get it to come up in Safe mode after many tries (even tried resetting Nvram / Pram technique but won't start up.
Anything I can do now short of replacing it? Thnx, Jim
 

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I'm not sure I would fool it with any longer. According to Mactracker, your iMac is a 2006 model (maybe 2007) so it's seen better years. The symptoms could be anything from a bad hard drive (even though it verifies) to memory or graphics. Your machine uses a nVidia GPU which during those years was known to be problematic in the MacBook Pro series.

Since it's now giving you problems is safe mode, that may indicate a hardware defect. But like I said above, it's an old machine and may not be worth the time and money to repair it. Might be time to retire it and get something newer.
 

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