I have one that had been working before but it started to shut down when i pressed del to enter bios. Now it is only a black screen and you can't turn off the computer or reset by usual buttoms. I have tried to take away the battery but it is still the same. I can't hear no beeping from the speaker just i used to hear before. I have tried to remove the memory as it used to beep without but not now. My screen seems to react when i power on the computer so it seems to react to power from the graphic card. I have tried 3 different cards. I guess it is the bios that has gone wrong?