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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

Kernel panics and screen glitches on iMac


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cantomdesign

 
Member Since: Jan 30, 2011
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Lately, I've been having a lot of difficulty with my work iMac.

Within minutes of booting up, I receive kernel panics, more frequently accompanied by screen glitches such as horizontal lines or holes in windows.

Often I don't even make it past start-up, and I receive a kernel panic before I can login.

I'm currently working in safe mode and everything seems to be running smoothly. No glitches, no kernel panics. No sign that the computer will immediately shut down. In fact, I'm thinking of simply working in safe mode from now on.

Any assistance would be greatly appreciated. I've reinstalled the previous RAM we used (we've recently installed new RAM, and we thought that this may have been the problem), and I've run Apple Hardware Test. Both have not improved matters, and the test came back free of issues.

Please let me know if I need to include anymore information that may assist.

Below is a log of the latest panic:

panic(cpu 1 caller 0x001A49CB): Unresolved kernel trap (CPU 1, Type 14=page fault), registers:
CR0: 0x8001003b, CR2: 0x4f0fe38e, CR3: 0x0123f000, CR4: 0x000006e0
EAX: 0xbeef7201, EBX: 0x0013999b, ECX: 0x00000585, EDX: 0x4f0fe000
CR2: 0x4f0fe38e, EBP: 0x25a4bb58, ESI: 0x04620000, EDI: 0xbeef7201
EFL: 0x00010206, EIP: 0x0090057a, CS: 0x00000008, DS: 0x00000010

Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x25a4b908 : 0x128d0d (0x3cc65c 0x25a4b92c 0x131f95 0x0)
0x25a4b948 : 0x1a49cb (0x3d2a94 0x1 0xe 0x3d22b8)
0x25a4ba58 : 0x19b3a4 (0x25a4ba70 0x0 0x3 0x7029)
0x25a4bb58 : 0x90068e (0x4620000 0xbeef7201 0x0 0x0)
0x25a4bb78 : 0x9006ec (0x4620000 0xbeef7201 0x1 0x4620000)
0x25a4bbb8 : 0x8fa016 (0x4620000 0x479d000 0x2faa9080 0xa17080)
0x25a4bc48 : 0x8e4857 (0x479d000 0x4888a00 0x1074a000 0x0)
0x25a4bcf8 : 0x3b19b9 (0x479d000 0x1 0x25a4bd2c 0x25a4bd28)
0x25a4bd38 : 0x3b4e75 (0x479d000 0x1 0x3ff1010 0x1)
0x25a4bd68 : 0x189fdc (0x479d000 0x1 0x3ff1010 0x4c23dc0)
0x25a4bdb8 : 0x12b4ee (0x4c23d8c 0x40d2da0 0x25a4bdf8 0x11e042)
0x25a4bdf8 : 0x124b17 (0x4c23d00 0x3fbd5a8 0x470752c 0x0)
0x25a4bf08 : 0x195f2e (0x25a4bf44 0x0 0x0 0x0)
0x25a4bfc8 : 0x19b81e (0x46d85a0 0x1 0x10 0x46d85a0) No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0xbfffed58
Kernel loadable modules in backtrace (with dependencies):
com.apple.GeForce(4.5.6)@0x8d1000
dependency: com.apple.iokit.IOPCIFamily(2.2)@0x5bb000
dependency: com.apple.iokit.IOGraphicsFamily(1.4.8)@0x6ab000
dependency: com.apple.iokit.IONDRVSupport(1.4.8)@0x6c6000
dependency: com.apple.NVDAResman(4.5.6)@0x6d5000

Kernel version:
Darwin Kernel Version 8.11.1: Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/RELEASE_I386
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chscag

 
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Are you sure you posted the entire log entry? Looks like part of it is missing as I don't see the point of entry into panic.
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EvenStranger

 
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Backtrace terminated-invalid frame pointer 0xbfffed58
Kernel loadable modules in backtrace (with dependencies):
com.apple.GeForce(4.5.6)@0x8d1000
dependency: com.apple.iokit.IOPCIFamily(2.2)@0x5bb000
dependency: com.apple.iokit.IOGraphicsFamily(1.4.8)@0x6ab000
dependency: com.apple.iokit.IONDRVSupport(1.4.8)@0x6c6000
dependency: com.apple.NVDAResman(4.5.6)@0x6d5000

From your description and the lines above, it definitely sounds as though the video card is bad. Depending on the model of iMac, it could be just a video card or it could be a full logic board replacement. Either way, I'd take it to an Apple repair center and have it fixed. If it's still under warranty, then you're golden. Depending on the age of the iMac, if it's a full logic board replacement, you might find that it's more cost effective in the long run to replace the unit with a newer one.
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MacMan886

 
Member Since: Jan 20, 2011
Location: Amherst, Ohio
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Mac Specs: Late 2012 Mini - 2.5GHz i5, 16GB RAM, 60GB OWC SSD, 500GB HD

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Is this a G5 iMac? If so, you are probably experiencing bad capacitors. It was quite the common problem with the G5 iMacs.

I have a link somewhere on here with a site that sells capacitor kits for the iMacs. Just search my username to find it.

EDIT - Here's the link

http://www.ifixmaccomputers.com/capacitor-repair-kit

-William
Late 2012 Mini - 2.5GHz i5, 16GB RAM, 60GB OWC SSD, 500GB HD
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