I have a Dell 2400 that sometimes will not go past POST. It appears to finish POST, but when this happens, I cannot get into safe mode or setup. I just get a blinking curser. This happen after trying to load an audio driver (the wrong one) and I got the blue screen of death. I have run every diagnostic program I can find and have found nothing wrong. I cannot get it to fail now, but have taken it back to friends home and it would not load windows. Maybe it will be fine this next trip. Any thoughts?