Alrighty. I have an old, old Tualatin Celeron system (In an ancient, ancient Compaq Deskpro case) that I put together for my parent's house bomb-shelter (I live in southern Israel, well in range of our friendly neighbours' rockets, so the ability to have internet access in said shelter is somewhat important). Now, I seem to have the most annoying POST problems with it, every time the computer is powered up, it fails to POST. If you power it down and power it back up again, then it still fails to POST. But, if you power it up, then hit the reset button, it POSTs like a charm and works perfectly. Now, this workaround is sufficient, since the computer is not in everyday use, but I don't have the slightest idea why the problem occurs in the first place. Specs, if they help: CPU: Intel Celeron (Tualatin) 1.4Ghz PSU: Compaq 180W P3 HDD: Western Digital 10Gb GPU: HD2400Pro AGP DVD: Some LG IDE DVD drive. Addon Cards: Yamaha DS1 Sound Card, Broadcom 100Mbit Ethernet Card, Via PCI SATA&IDE controller (Same problem occurs with any combination of addon cards). Motherboard: CPU-Z calls it "VT82C694X", the chipset is the Apollo Pro and the SB is the VT82C686. I replaced the CMOS battery with a new one, and it still keeps doing the same thing. Any ideas ?