Computer turns it self off and won't turn back on. [Anwsered]

Computer turns it self off and won't turn back on.

My computer is only a few months old.  I have it connected to the power through a UPS device as our house has electricity surges quite a bit.  In the last few weeks it has started turning itself off.  I then can't turn it back on - pressing the power button
does nothing, also, the reset button does nothing.  I can get it to start again by taking the power cord out for a long time - at least a few hours - and then it powers straight up again.  Once it starts back up it works fine until the problem happens again. 
I have tried changing the power settings to stop it from going into sleep mode but this hasn't worked, the problem still occurs.  I have also tried pluggin it into different power points, but this makes no difference.  Please help.

Keys to the Problem Computer turns it self off and won't turn back on.

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If this happens both with and without the UPS between the machine and the mains I suspect the system power supply unit (PSU) is faulty.
It might also be a capacitor breakdown on the motherboard.
Substituting a known good PSU would be the first step to see if the problem recurs.

Machine Throttling

• Click the Start button.
• In the Search box, type "regedit" (without quotes) and press Enter.
• Look for the following registry key: "HKEY_LOCAL_MACHINE\SOFTWARE\ Microsoft\ SQMClient\Windows\DisabledSessions".
• On the right window pane, delete the subkey: "Machine Throttling".
• Restart your system.

Another Safe way to Fix the Problem: Computer turns it self off and won't turn back on.:

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