Sounds like problems coming out of sleep mode.
Are you running Win 7 ?

Try enabling usb keyboard in bios, it's sometimes off by default....Don't know why it works, but sometimes does.

or...

Try to boot in to the Advance Boot Menu and select Last Known Good Configuration (LKGC). For more information follow the link given below.

Advanced startup options (including safe mode)

http://windows.microsoft.com/en-US/w...ding-safe-mode