iMac g3 rev d not turning on

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Joined: Jun 29 2009
Posts: 60

yesterday i rescued an imac g3 (tray-loading) 333mhz from the trash. it was running fine and booted into os 9. it only had 64mb (2x32) of ram, so i decided to upgrade the ram so it would take osx. i opened the imac up, replaced both of the ram sticks, and reassembled the computer. now it will not boot. not only will it not boot, but it will not do ANYTHING. i tried replacing the new ram w/ the old ram but still, when i press the power button absolutely nothing happens. no lights, no noise, nothing. i have also tried the power button on the keyboard and still nothing. i have other i macs like this but missing the logic board. and help would be greatly appreciated, as well and any other (mod) ideas.

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cwsmith's picture
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Joined: Oct 13 2005
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PRAM battery?

If the iMac was sitting in the trash, heaven knows how long it was unplugged.

Remove the PRAM battery and test it with a voltmeter. If less than 3V, replace it with a new one. You can get replacement batteries at Radio Shack, Interstate Battery, or online at places like WeLoveMacs.com.

The machine will boot without a PRAM battery (sometimes more reliably than with a drained battery), but the machine will "forget" certain settings whenever the machine is unplugged: settings like date & time, volume, startup disk, monitor resolution, etc.

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Joined: Jun 29 2009
Posts: 60
the only reason i do not susp

the only reason i do not suspect this is because it worked fine last night. would changing the ram affect that?

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Dr. Webster's picture
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Joined: Dec 19 2003
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Re: the only reason i do not susp

geeko wrote:

the only reason i do not suspect this is because it worked fine last night. would changing the ram affect that?

It would if you happened to give the motherboard a good zap of static electricity while swapping the RAM.

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Eudimorphodon's picture
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Joined: Dec 21 2003
Posts: 1204
It's also worth checking...

to make sure you have the CPU board properly fitted. The connector is pretty gimpy and the design of that little cage around it can make it difficult to seat it correctly.

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Joined: Jun 29 2009
Posts: 60
thanks to all

i got it working again by leaving it unplugged for ~an hour. then it worked just fine. now it has 256mb of ram and 10.3 installed

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