when i start up my computer, it goes to the 1st and 2nd screens with no problem but before it loads windows, the screen goes black. if i press anything the computer restarts. i tryed starting it in safe mode, safe mode w/ command prompt, start w/ last working configuration, and in vga mode but all of those have the same reactions. i get a single beep like always when it starts up. i have started it before and it was fine, this isnt a new computer.