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PC not booting M'board or Power Supply?

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PC not booting M'board or Power Supply?

gammada
My VAIO PC suddenly went black while working on Photoshop. After that the monitor shut itself off --no video signal- and the PC lit the memory card reader LED as if stuck without having any card inside. Power button didn't respond so I had to unplug the machine entirely.

After that, all subsequent attempts to boot up the machine bring the same results: Fans go full blast, HD read LED goes lit, power LED also comes on but there seems to be no HD starting and there is no power on either the keyboard (PS2) or the mouse (USB) and no video signal coming out. The machine did this previously but it always got back to work with a switch off/ on technique.

Any ideas as to what is happening here?