New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

 
Start a Discussion
 

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

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

Power Mac - Mac G5 won't boot with New memory


Post Reply New Thread Subscribe

 
Thread Tools
swg1cor14

 
Member Since: Aug 07, 2008
Posts: 3
swg1cor14 is on a distinguished road

swg1cor14 is offline
Machine Name: Power Mac G5
Machine Model: PowerMac7,2
CPU Type: PowerPC 970 (2.2)
Number Of CPUs: 1
CPU Speed: 1.6 GHz
L2 Cache (per CPU): 512 KB
Memory: 2 GB
Bus Speed: 800 MHz
Boot ROM Version: 5.1.5f2

I currently have 2 GB ram as you can see from my computer specs. They are 4 512MB ram chips that are paired memory. So I'm trying to take 1 pair out and put 2 UNPAIRED 1 GB chips in there making a total of 3 GB but my computer will not boot. Let me share the specs of the ram i have then give more details.

Current Ram:
2 x 512MB Unbuffered PC2700 CL2.5 from Apacer
2 x 512MB KVR400X64C3A/512 from Kingston

New Ram:
1 GB DDR 400, CL3 PC3200U from Aeneon
1 GB 184-PIN UNBUFF DIMM from Crucial

The Crucial 1GB chip is confirmed MAC compatible from Crucial themselves. The Aeneon chip is supposed to be MAC compatible but I can't get a confirmed answer on that.

I've tried every configuration I could think of. Strange thing is the system will not boot with just 1 pair of ram in the system by itself. (ie. Just the 2 Kingstons or just the 2 Apacers). It will not boot with just 1 chip of either the 1GB.

WHEN I SAY IT WONT BOOT, I MEAN IT POWERS UP BUT NO CHIME AND POWER LIGHT JUST BLINKS.

I pressed S1 inside the case to reset PVRAM but I can't do any of those "command + option...." tricks because system has to actually boot for that to be used. I've tried all 4 slots with just 1 chip in it.

Conclusion Thus Far:
Only setup that will work is with both sets of paired ram installed.

Other notes:
I would of gotten 2 Crucial chips but I didn't have the funds. The Aeneon was cheaper at a different store and I had funds to get 1 Crucial and 1 Aeneon. But that shouldn't matter.
The fact that 1 chip is PC3200 and one is PC2700 doesn't matter. Crucial's memory configurator says I can use either PC2700 or PC3200. Crucial rep confirmed I can use both at same time.

Any help would be greatly appreciated.
QUOTE Thanks
kahlil88

 
kahlil88's Avatar
 
Member Since: Jan 29, 2008
Location: Mendocino, CA
Posts: 680
kahlil88 is a jewel in the roughkahlil88 is a jewel in the rough
Mac Specs: 17" MacBook Pro A1151 2.16 GHz

kahlil88 is offline
It might not like the RAM - could be bad or maybe incompatible. I would try re-seating it and maybe even blowing any dust out of the slots.

There is no system but GNU and Linux is one of its kernels.
Join the FSF as an Associate Member!

QUOTE Thanks
swg1cor14

 
Member Since: Aug 07, 2008
Posts: 3
swg1cor14 is on a distinguished road

swg1cor14 is offline
I dusted it all out. And I know the Crucial RAM IS compatible. The Aeneon RAM is supposed to be compatible.

But that doesn't explain why just one pair of the working ram will not allow the system to boot either.

The only way I can get it to boot is if BOTH PAIRS of RAM is in there.
QUOTE Thanks
hughvane

 
hughvane's Avatar
 
Member Since: May 18, 2008
Location: Banks Peninsula, New Zealand
Posts: 3,264
hughvane is just really nicehughvane is just really nicehughvane is just really nicehughvane is just really nicehughvane is just really nice
Mac Specs: MacMini 2.4, 4 Gb, OS 10.9 and 10.6; MacBook 2.4, 2 Gb, OS 10.6.8

hughvane is offline
Quote:
Originally Posted by swg1cor14 View Post
I dusted it all out. And I know the Crucial RAM IS compatible. The Aeneon RAM is supposed to be compatible.
But that doesn't explain why just one pair of the working ram will not allow the system to boot either.
The only way I can get it to boot is if BOTH PAIRS of RAM is in there.
What's the minimum RAM req'd for that model of G5?

Workaround (maybe):
1. Put all the old RAM sticks back in.
2. Boot up your G5, get everything running tickety-boo (if poss).
3. Open Activity Monitor. See what's happening with memory there. Compare Used with Free to see if it totals the physical RAM (ignore VM).
4. Open System Profiler - check physical memory to see if all sticks are being read and utilised.

4 RAM slots - right? You want to go to 2 Gb RAM total. Have you considered getting two more of those 512MB KVR400X64C3A/512 from Kingston, (assuming they're working okay via the checks above)? 4 x matched RAM sticks would be my choice.

From what you've posted, it reads as though there's RAM incompatibility involved. There are simple RAM check software programs available, MemTest is one (Google for others).

As kahlil88 says, it may not be a RAM problem. Check all other cards inside your G5 (assuming it's a tower model), make sure they're seated right. You've been opening up that G5 to replace/reinsert RAM quite a bit, something may have been dislodged.
QUOTE Thanks
swg1cor14

 
Member Since: Aug 07, 2008
Posts: 3
swg1cor14 is on a distinguished road

swg1cor14 is offline
No. Maximum Ram for this system is 4GB. Which I am trying to accomplish that. Right now I only have enough to make 3GB. (2x 1GB chips and 2x 512MB chips (Paired))

I can't boot system with new ram AND old ram installed. I tried BOTH these new ram chips in another mac and it won't recognize them either. I will ship this ram back and get new.
QUOTE Thanks

Post Reply New Thread Subscribe


« G4 quicksilver (2002) Dual 1 GHZ won't shutdown | Is this a good deal? »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Forum Jump

Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
Who's got the most Macs? narf1899 Schweb's Lounge 139 11-24-2012 11:53 AM
Mac Songs The mac 13 Switcher Hangout 7 05-06-2010 01:35 AM
Macbook Pro: Windows under boot camp - cannot find setup.exe on mac os dvd arnie.s Running Windows (or anything else) on your Mac 8 06-06-2009 08:49 PM
Questions about Mac Mini and Imac-how much power? markw10 Apple Desktops 3 08-22-2006 07:12 PM

All times are GMT -4. The time now is 07:01 PM.

Powered by vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
X

Welcome to Mac-Forums.com

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!


(4 digit year)

Already a member?