I am having a problem with my computer (Windows XP, 1Gig Celeron, 512 PC133 RAM) booting up. Whenever I completely power down my computer, even if it has only been on for a few minutes, I cannot immediately power up my computer. The drive lights come on, but I don't get the power-on beep or anything on my monitor. If I leave my computer off for 20 minutes or so, it will then power up. At first I thought it was overheating and needed to cool down before coming back on, but now it doesn't matter if it has been on for a few minutes or a few hours. I have run applications that tell me the cpu temp and it is running well below the max temp rating. I don't have any problems if I just do a restart. It's only when I completely power down.