Won't Start Up........Power LIght Blinks 3 Times

My G5 dual 1.8ghz has failed on me. Yesterday it would not start and the power light was pulsing 3 flashes repeatedly. I tried to start in target mode - nothing. Removed the DIMMs to check for faulty DIMMs - nothing. Managed to instal an installer disk - nothing. Eventually, zapped the PRAM and it started. However, this morning it is dead again and will not start. Zapping the PRAM makes no difference.
I have tried removing USB devices - nothing.
Any ideas?

Hi-
Sounds like a typical failure of the solder around the RAM slots.
To test for this, use a hairdryer to heat the logic board around the RAM slots.
Make the board very warm, then try and boot.
If the machine boots, leave it on, as when the machine cools, the connections will be lost again.
What this shows, if successful, is that the expansion due to heat is able to "revive" the connections at the solder points.
The fix for this problem, unfortunately, is a replacement logic board, or, to have the board reflowed.
A company in Germany does this:
www.golytronic.de
Related discussion:
http://discussions.apple.com/thread.jspa?messageID=11004168&#11004168
http://discussions.apple.com/thread.jspa?messageID=11050184&#11050184
http://discussions.apple.com/thread.jspa?messageID=11294720&#11294720

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Won't Start Up........Power LIght Blinks 3 Times

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