Try using a PS2 mouse and PS2 keyboard. It may be that your USB ports have lost their setup (assuming that you are using USB or wireless mouse and keyboard). If the PS2 hardware works fine, check that your USB ports are enabled in the BIOS, then check your device drivers in Windows to see that the USB hardware is recognized.
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The computer is actually a Toshiba Satellite C655 running Win 7. The screen looks normal during boot, ie the brightness and contrast is normal & remains that way through the Win Logo and request for PW. If I touch the mouse or any key durring this process the screen goes almost black. I can barely make out the desktop & cursor movement.
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