Black Screen,No chime, No HDD activity, No Fan Activity, Solid Light, It does boot when its warm (40 min or more after)

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Black Screen,No chime, No HDD activity, No Fan Activity, Solid Light, It does boot when its warm (40 min or more after)

The works normally after it has been turned on for a while like 40 min or more later after leaving it on, eventually it turn on byitself and everything works normally, the problem is that if u turn it off and turn it on again 1 day later of after the computer temperature its cold it wont boot it stay Black Screen,No chime, No HDD activity, No Fan Activity. Diagnostic Led 1 and 2 are turn on led 3 its off

iMac

Posted on Nov 25, 2012 5:05 AM

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Answer 1

Nov 27, 2012 9:10 PM in response to FenixAzul

This is just a possibilty:

I think your PRAM battery needs replaced. When you turn off the computer the PRAM battery dies. When you turn the computer on and leave it for forty minutes, it trickle charges the PRAM, and builds enough temporary power to launch the startup.

Depending on your iMac model, you may or may not be able to replace it yourself. I see G5 is marked as a tag. If you have a G5 iSight model, you can't do the replacement yourself. All other G5 models the install is very easy.

Here is a link to the PRAM battery for the G5 iMac:

http://www.google.com/earth/download/ge/agree.html

Here's a link to installing RAM in a G5 (it shows how to open the back of the iMac to get to the PRAM battery):

http://eshop.macsales.com/installvideos/imac_g5_mem_m/

Good luck.

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