Resetting Screen Resolution... (screen is black)?

i tried changing my screen resolution and now its says, 'Auto Detect (Analog Input) : Cannot Display This Video Mode'.. So now my screen is black and I don't know what to do? Someone was telling me to press F8 when starting up so I could change my resolution form there but I need step by... show more i tried changing my screen resolution and now its says, 'Auto Detect (Analog Input) : Cannot Display This Video Mode'..

So now my screen is black and I don't know what to do? Someone was telling me to press F8 when starting up so I could change my resolution form there but I need step by step..

Please someone help.. I have a Dell Vostro 200..

MY EMAIL IS: lily.leee@ymail.com
Update: MY SCREEN IS PITCHED BLACK, CANT SEE MY DESKTOP.. BUT THANKS ANYWAYS =D IMA END UP RESTARTING (REBOOTING) THE WHOLE COMPUTER.. THANKS EVERYONE!
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