i have a hp compaq nc6220 and every time i try to get it to boot up it either stays blank with the console lights flashing or on (power, battery, hard drive) or it boots to the hp logo with a message that says press f10 to enter rom based setup. sometimes it enters setup and others it locks up on entering setup. it boots fine one out of every 20 or so tries but blue screens when i disable and re-enable the cd drive so i can reinstall the os, cd drive wont do anything but reports no problem. please help! running windows xp