I turn on this computer, and all it does is display the amount of RAM (512M) at the top. Nothing else on the screen except the computer model number at the bottom and "press DEL for Setup". I press DEL and nothing happens. I tried the mobo CMOS reset button, removed the battery, turned it on with batt in or out, but no help. It was working fine up until this. I don't recall the specs, but it is an HP, at least a Pentium4 2.0, less than 3 years old.