Power Mac G5 apple logo stuck and fans running full speed

HI everybody,
I have been looking around in many forums and i noticed that a lot of people encountered a similar problem. Unfortunately untill now, nobody could give a real suggestion on how solve this issue.
In few words, my G5 (late 2005) 2gh 5gb ram 10.5.8 get stuck to the apple logo (grey initial screen) without going trough the start up. After a while the fans start to run full speed.
I have tried several solutions....but nothing so for.
I have reset the SMU button.
I removed all the ram slot and changed position.
The HD is ok and empty.
I even tried to warm the logic board with an hair drier as i read in a discussion...and i don't know why, the G5 could go trough the start up. Since it was active, i run the apple test. Result: All Ok
After rebooting successfully for 4/5 times, i switched it off. The morning after the G5 was dead again.
I am kind of lost.
Any suggestion?
Tnx

Try a Heat gun...
https://discussions.apple.com/message/16781690#16781690

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    Message was edited by: Pierobon
    Message was edited by: Pierobon

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