Early 2009 suddenly shuts down or won't startup

Hi, I've recently been having some problems with my mac pro 2009. It will suddenly shut down and won't restart or if left for a while won't startup.
Sometimes if I press the power button it will sort of startup but then suddenly turn off during the initial powerup (before the screen turns on).
I brought it in for repair and they replace the power supply, called apple and end the end they said they reset something on the motherboard but couldn't really find what was wrong... Has anyone else had this problem and found a solution?

Hi Phil,
Has anyone else had this problem and found a solution?
I hate to be blunt, Phil, but the real solution is to get Apple to give you a replacement. You're within your rights as a consumer to have a perfectly working Macintosh. Most of us do. I haven't read a bad report on these machines yet, but if it's not working right then something is wrong.
Good luck.
Steve

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