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Old Jul 28th, 2006, 10:29 PM   #1
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Help with G3 iMac, please

Hi, group,

I bought a defective iMac G3 on eBay. Don't feel too sorry for me - I knew out front that it had problems, and hoped I could deal with them. I didn't pay much.

The iMac is the original model G3 233 MHz, the first revision with ATI graphics and extra VRAM.

The problem - when the power button is pushed, it lights up amber and startup begins.

Startup chime is normal.

Just as it gets to the point where video is supposed to kick in, the power button changes to green, the monitor-starting-up "bonk" occurs, and then...

...it just shuts down.

I have tried all the normal stuff - new PRAM battery, reset the CUDA switch, reset the motherboard, all no luck. If I disconnect the video, the shutdown doesn't happen, but the power button stays amber. Plugging in the video again produces no change.

So, any ideas?

Cheers :-> Bill
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Old Jul 28th, 2006, 11:15 PM   #2
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Have you tried booting from a CD? I replaced the HD on my iMac and have found a workd of difference.
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Old Jul 28th, 2006, 11:26 PM   #3
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Try hooking up an external monitor to it once you have removed the internal connection.See if you get video then?
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Old Jul 28th, 2006, 11:30 PM   #4
 
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I had that happen to one of mine, it ended up that a ram chip went south. I did all the same things you did. might work for you might not. good luck
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Old Jul 29th, 2006, 12:16 AM   #5
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Quote:
Originally Posted by chuckster
Have you tried booting from a CD? I replaced the HD on my iMac and have found a workd of difference.
Thanks. It never gets to the point where it's looking for a System - it quits just where you expect the video to light up.
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Old Jul 29th, 2006, 12:17 AM   #6
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It's dead. Give up - they are well past their service life and simply not worth the time or hassle when 350s are around under $100



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Old Jul 29th, 2006, 12:18 AM   #7
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Quote:
Originally Posted by James Z
Try hooking up an external monitor to it once you have removed the internal connection.See if you get video then?
Thanks. I tried that - no video signal and the startup doesn't even proceed as far as it does with the built-in video.
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Old Jul 29th, 2006, 12:19 AM   #8
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Quote:
Originally Posted by macpablo
I had that happen to one of mine, it ended up that a ram chip went south. I did all the same things you did. might work for you might not. good luck
Tried removing each of the RAM chips - no difference.
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Old Jul 29th, 2006, 12:22 AM   #9
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Quote:
Originally Posted by MacDoc
It's dead. Give up - they are well past their service life and simply not worth the time or hassle when 350s are around under $100
Thanks. That's how it will likely end up. However, I'd like to get it working if I can just because I never owned one of these when they were current. I never had the experience of taking them apart and troubleshooting them. My current best guess as to the cause of it all is the analog board. Maybe I can find a G3 for sale locally with a fried motherboard and "mix & match."
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Old Jul 29th, 2006, 01:13 PM   #10
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From the Apple take apart service manual;

1/ If you are unable to restart your computer, try pressing the
Command and Control keys simultaneously while also pressing the power
button on your Apple USB keyboard or on the front of the computer.

2/ Open the cover on the side of your computer and locate the Reset hole
(itís the upper hole on the right side, between the Ethernet and modem ports).
Carefully insert the end of a large straightened paper clip into the hole and push gently.
Do not use excessive force. Your computer should restart.
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