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You first need to check the screen is working, disconnect the VGA/DVI cable from the monitor, then turn it on do you get anything on screen at all?
If that works reconnect the cable and turn it on, now boot the PC, do you see anything at all on the monitor?
No then check the cable/swop with new one or check the graphics card.
Yes but goes off after a few seconds, reboot and press the F8 key as soon as you hear the first beep, this should bring up a start menu, try safe mode, if that works load and windows it might be the graphics driver (has this been updated?) if yes try roll back to previous driver or you could even try system restore back to a date you know it all worked.
start tapping f8 after you boot the machine, when given the boot menu, try to load safe mode, and see if it loads. if it does, then you need to do a system restore back to before you got the black screen. more than likely windows loaded an updated driver that disagrees with your system. try that and let me know what happens :)
do a power drain...take out the ac adapter and the battery and then press and hold down the power button for 1 min....
then go to the BIOS screen and set a BIOS default...
then do a bios update from your computer's manufacturer's homepage...
if the power just shuts off for no reason when booted up,it may be the power source is on the way out ,it will work for a while, but keeps crashing, thats the first thing to replace
also make sure you hear the fans working
if it overheats it has a safty shutoff ,
you can also use a house fan, aimed inside the computer while open, to rule out power source