Help, Mac Pro wouldn't start now stuck on grey screen

Hi,
My Mac Pro computer wouldn't start up properly. Sometimes I would press the button 30 times and still it wouldn't start.
I have taken it to a Authorised Apple shop and first of all had a new graphics board replaced.
A week later the same problem, it wouldn't start up, some times switch itself off so I took it back to the Apple shop where it turned on perfectly and the tests showed nothing wrong.
Week and a half later it happened again so I took it back and they gave me a new hard drive and memory cage.
Three weeks later, same problem took it back to the store and they found nothing wrong with it so I had to bring it back home.
Worked again for another week and then it wouldn't start a few times so I left it on and it turned itself off.
Today it is starts but gets stuck on the grey screen with spinning wheel and then turns itself off.
Please, please can anybody help. The Authorised Apple shop doesn't know what the problem is so has given up..
Best Regards..

If you unplug it from all power & peripherals like taking it in would do, wait a few hours & plug it back in does it work?
Is there an Uninterruptible Power Supply involved?

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