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

iMac - iMac 333 Memory Upgrade Problems


Post Reply New Thread Subscribe

 
Thread Tools
kevinc5680

 
Member Since: May 20, 2006
Posts: 41
kevinc5680 is on a distinguished road
Mac Specs: PowerMac G5 Dual 2.0Ghz, 250GB Hard Drive, 4GB RAM, GeForce FX5200, iPhone 3G 8GB

kevinc5680 is offline
I have an iMac G3 333 system. I bought it from someone who said they had put a 512MB upgrade inside of it. When I booted the system up, it only read 320MB (1x64, 1x256). I opened the system to upgrade the HD from 6GB to 20GB, only to find out that there was a 512MB PC133 chip in there. So I assumed that this system couldn't read anything over 256MB, I installed a 256MB PC133 chip. Now my system reads 192MB. Why is it only recognizing half of the memory??

Also, I installed my Quantum Fireball 20GB hard drive I pulled out of my Powermac G4 AGP Graphics and it wont boot to it. I can boot a CD and install Mac OS X, but when I restart after installation, it looks for a CD.
QUOTE Thanks
cradom

 
cradom's Avatar
 
Member Since: Feb 14, 2004
Location: Nederland, Texas
Posts: 2,884
cradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud of
Mac Specs: 21in iMac core2 Duo- 13in macbook - 10.9 on both

cradom is offline
As far as the HD, you have to partition the drive so there is an 8 gig partition first (slightly less than 8), and the rest second. Install X on the first partition.
There is a limitation in the rom on boot partition size on the older imacs.

The 333 can use 512mb. Maybe you have a bad mem stick?

Craig Domingue - resident redneck.
QUOTE Thanks
kevinc5680

 
Member Since: May 20, 2006
Posts: 41
kevinc5680 is on a distinguished road
Mac Specs: PowerMac G5 Dual 2.0Ghz, 250GB Hard Drive, 4GB RAM, GeForce FX5200, iPhone 3G 8GB

kevinc5680 is offline
Both the 512MB and the 256MB are showing up only half of what they are supposed to. I put the 512MB in my ibook G3 and it worked fine. Second, I partitioned the HD, but it's still not booting. Do I need to change the jumper settings? Again, I can hold "c" and install the OS, but when I go to restart, it comes up with the "?" and can't boot the system.
QUOTE Thanks
cradom

 
cradom's Avatar
 
Member Since: Feb 14, 2004
Location: Nederland, Texas
Posts: 2,884
cradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud ofcradom has much to be proud of
Mac Specs: 21in iMac core2 Duo- 13in macbook - 10.9 on both

cradom is offline
Make sure the drive jumpers are set to CS or master. What version of X are you installing? The 333 can only run Panther without using something like XPostFacto.

The 512mb stick will not work in a 333. It takes 2 256 sticks to get 512. (and the second one, under the cpu, is a special low profile one).
Dont know why it's not reading the 256.

I've upgraded 2 Rev D 333 imacs to 512 without any problems.

Craig Domingue - resident redneck.
QUOTE Thanks
MacHeadCase
Guest
 
Posts: n/a

Yeah it would appear that some G3 iMac models accept more RAM while others do not. From iMac G3/333 (Rev. D) - code name: Lifesavers:

Quote:
RAM: 32 MB, expandable to 384 MB using SO-DIMM SDRAM (3.3V, unbuffered, 64-bit, 144-pin, 100 MHz or faster, 10ns) in two DIMM sockets (256 MB on top, 128 MB on bottom), top DIMM socket accepts 2" DIMM, bottom socket takes 1.5" DIMM
* The exact amount a Rev. A-D iMac can be upgraded varies from unit to unit. We have field reports of some models accepting 256 MB modules in both memory socket and reaching 512 MB - and other reports of early iMacs that won't work at all with 256 MB modules. There appears to be no way to know in advance whether a particular iMac will work with a certain sized memory module.
QUOTE Thanks
kevinc5680

 
Member Since: May 20, 2006
Posts: 41
kevinc5680 is on a distinguished road
Mac Specs: PowerMac G5 Dual 2.0Ghz, 250GB Hard Drive, 4GB RAM, GeForce FX5200, iPhone 3G 8GB

kevinc5680 is offline
Yeah I fixed the HD problem, the system only boots it if set to master, not CS. As for the RAM it doesn't make sense. I understand that a 512MB chip isn't compatible, but it was reading 256MB when that chip was in there, so you'd think that by adding a 256MB chip, it would take in the full 256MB, but it only reads half (128MB). I'm getting 192MB right now (64MB bottom, "128MB" top). There isn't much I can do I guess, I have four PC133 256MB chips and none of them are registering the full 256MB when installed. I'm running OS X 10.2 and it's running fine right now.
QUOTE Thanks

Post Reply New Thread Subscribe


« PowerMac : G4 (Digital Audio Model) : Optical Drive | dim screen »
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
imac memory question... stuntboy Apple Desktops 4 08-16-2006 04:14 PM
IMac memory problems dmm333 Images, Graphic Design, and Digital Photography 1 11-16-2005 01:10 PM
G5 memory problems dfemorton Apple Desktops 5 09-06-2005 06:13 AM
iMac G4 1GB memory upgrades available Murlyn Apple Desktops 2 09-01-2005 04:47 PM
iMac do it yourself memory upgrade: how easy/hard? walkerj Apple Desktops 7 05-05-2005 07:15 AM

All times are GMT -4. The time now is 03:14 AM.

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?