Motherboard is an ASUS P4S333 with the latest BIOS. CPU is a 1.6 P4. Starting about 6 months ago, the system would neither beep when switched on, nor would it wake the monitor from sleep. I pulled out all the cards (including the video card), and the RAM, and the system still would not beep to report any errors. At the time I figured it must be a bad motherboard (which was also an ASUS P4S333), so I went on eBay and bought a replacement board. I put it all together, turned it on, and it worked fine for about a week. Now it's doing the same thing again and I'm left to wonder if the CPU is failing since that seems to be the only constant involved. It always boots if I clear the BIOS, forcing it to ask me for the CPU speed information, but once I save changes and exit the BIOS menu the monitor will go to sleep and the system won't boot. Thoughts? Suggestions?