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Those internal things are CMOS reset. that won't help you. but try this. Unplug the computer for a while, while cylcing the power button, then plug it back in. The power supply has an internal circut breaker and this will hold open as long as the power is still applied. once drained it will close and if it is still good you should be able to start it.
Try the booting from the windows cd and repairing the os? if not working you may need a fresh install which means you will lose your data but your pc will still work. You can always download from www.ubuntu.com and burn the os to a cd rom and boot from cd, this will load a verison of linux, When cd rom starts chose RUN LIVE CD, this will not change the pc at all, when the os starts up you can go to places at the top and go through all your windows files and save the ones you want to keep to cd or external hd, then reistall windows, or who knows you might love linux and enjoy something thats free :)
one of the files in the system32 directory in the windows folder is corrupt, the files in the system32 folder contains vital files for the boot procedure, try to start the machine in "safe mode" by pressing F8 after the sony boot screen, if it allows you into the operating system you will need to choose "system Restore" take the time back to at least a week before your problems started DO NOT CREATE A RESTORE POINT
Most likely your CPU is overheating. Download speedfan from this link. Speedfan monitors the temperature of your CPU. Note the temperature when the PC shuts off on its own. Let me know if this is helpful.