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restart your computer repeatedly tapping the f8 key to enter safe mode while the screen is black once in safe mode where the only things working will be your keyboard and mouse allowing you to attempt to repair your computer you could select the option start at last known configuration that worked this will tell you if and what file has been corrupted or missing then you will know if its a hardware issue then select restart if the problem still persists f8 back into safe mode you might need to select your operating system to load into safe mode click start control panel administration tools computer management in the left panel events + to expand then system you will see all errors in right panel right click select properties this will tell you what has occurred and the time it occurred you might use the system restore to restore your system to an earlier time click start all programs accessories system tools you should see your system restore optionif it is a hardware issue the system restore might not work hope this helps you
During the boot process you will see on the screen to press a certain key to enter setup Press and hold that key during the boot up process to enter BIOS you can load failsafe defaultsor load optimized defaults ,press escape then press f10 to save to cmos to restart or During the boot process tap thef8 button three times this will boot into safe mode where the only things working will be your mouse and keyboard enabling you to attempt to repair your computer hope this helps don
when you turn your screen on does it turn on. if yes then it is a VGA card problem...if you remove the VGA card and use the onboard one, the problem will be the same because their can't be two VGA on one computer and if their is, the onboard VGA is bad and thats why you have another VGA card replacing it, and if that one goes bad also, then you need to buy a new one.