My brother lent my kids his pc. He had the sleep mode settings set too high and I decided to change them. I checked the internet and followed the instructions. Then, later, his computer went into sleep mode and will not come out! I may have checked the enable hibernate box. Is there anyone out there that can tell me if this can be fixed? The computer only beeps now when I try to turn it on. I have switched monitors and his works fine on my pc but mine only says ' no signal' on his and his says... 1. digital annoalogu.... sleep mode...hit any key or move the mouse...