I have a similar problem, my pc shuts down completly without warning , usually in game. i have changed the power suply from 500 w to 600w changed the motherboard and reinstalled vista but it still does it ranomly. im completly baffled!
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Your GPU gets hot, because when u start the console it gets hot, nd when u start a game it becomes hotter, when the system detects that ur GPU is hot it shuts down Automatically, the cause of this problem is common, you need to replace the GPU's thermal compound nd try to find the The Arctic Silver one, it's the best.. GOOD LUCK
Go to Power Options --> On the plan you are using select change plan settings --> Change advanced power settings --> Scroll down till you reach battery and click the + next to it to expand the settings --> Where it says Critical battery level and Critical battery action (on battery) make sure that the level is at 5% and the action is to hibernate. If it's set to do nothing, it will keep running until it's out of battery and completely shut off. Plugging the AC adapter would give it more power. If that isn't the problem, check your battery's connection and consider replacing the battery.
I think you have to shut your computer down completely and reboot. This means that you will lose any work you didn't save before going in standby mode.
If your PC has a 'reset' button (usually located near the power button), press it. Your machine should reboot. If it doesn't or if you don't have one, you can try pressing and holding the power button for about 5 seconds. This should shut down your computer completely. Press the power button once more and it should boot normally, though you might get a warning saying Windows didn't shut down properly. If you get the choice, just choose to boot Windows normally.
If pressing and holding the power button doesn't work, try looking for a power switch on the back of your machine. It should be near the power cable. Flip the switch, wait a few seconds and flip it again, then boot your computer as usual. You might get the same message which I mentioned above.
at first chack at which time it shutting down. if it happen when u click on any drive or when u using cd/dvd drive then power supply cant regulate power. then chack switching transistor and filter section capacitor.
(Be careful about filter capacitor in primary section because some time it stored high voltage dc after plug of power supply at first discharge this two capacitor.)
** also chack supply voltage r stady or not.
go to control panel>administrative tools>event viewer and look in the left hand listings at programmes etc and see if there are any red crosses or exclamation marks to give a clue as to the problem, but if you know it's not overheated and you have'nt recently installed any other software and recently scanned for virus and spyware it is probably a driver problem.