My girlfriend's mother's old Dell won't boot up anymore and she asked me to take a look at it. The power button will start up the fans and the hard drive, but it won't make it to BIOS and the monitor says there's no input. It doesn't turn off, it just sits there with the fans going, but never gets anywhere. It's an old Pentium 4, and I don't have any parts to swap out with it so I'm not really sure how to figure out what the trouble is. I opened it up, everything was connected as it should be. I removed the stick of RAM and the system acted the same without it as it did with it. Any ideas on what it might be or how to find out what's wrong?