Hi everyone. I'm hoping someone here might have some intel with this problem. I just purchased an entire system & built it this past weekend, the 27 & 28 Nov. These are all the components and periphials: SONY Black 1.44MB 3.5IN FLOPPY DRIVE CREATIVE SOUND BLASTER AUDIGY 2 ZS 7.1 1394 24BIT OEM SOUND CARD Samsung SyncMaster 793DF II Dynaflat 17IN SILVER-BLACK 1280X1024 .20MM(H) VGA CRT Monitor BenQ Optical Wheel Mouse BLACK-SILVER PS/2 Logitech Office Pro Keyboard Black PS/2 W/ Multimedia Keys & Detachable Palm Rest OEM BenQ DW1640 DVD +RW 16X8X16 -RW 16X6X16 Dual Layer +R 8X -R 4X Black IDE OEM Burner W/ SW Seagate Barracuda 7200.8 200GB IDE ATA100 7200RPM 8MB 8MS Hard Drive 5 Year MFR Warranty Kingston ValueRAM PC3200 512MB DDR400 CL3 184PIN DIMM Memory ASRock P4VM8 MATX PM800 S478 DDR AGP 3PCI AMR SATA RAID VIDEO SOUND LAN MOTHERBOARD Intel Celeron D 325 2.53GHZ S478 Prescott 533FSB 256KB Cache 90NM Processor Retail Box LOGITECH X-530 5.1 SPEAKER SYSTEM Black 70W RMS 140W W/FDD2 Casedge TW-02 16IN mATX Mid Tower Case 2X5.25 2X3.5EXT 1X3.5 300W Black Matte Finish /W Air Duct All went well Saturday and Sunday installing, etc. Everything was working fine and had OS installed (XP Pro) & working and shut computer down Saturday night. Started it back up on Sunday morning, got all hardware discs & programs installed, etc. Installed Norton Internet Security 2005 but removed it as I could not leave Norton Antivirus off, and installed Grisoft AVG. All working well. Started downloading updates from Microsoft. Re-booted everytime when asked and everything worked fine. Installed Everest Home Edition from Lavlys and printed a summary and it all showed OK Checked the Device Manager and it showed all was OK except for the USB2.0 driver not being installed so I installed it off the m/b disc (must have missed it the first time). Shut computer down Sunday night. Went to turn computer on Monday morning and all that would power up were the fans and enough power to light the led's and open DVD drive. No boot up of any kind on monitor; no CMOS, nothing. Re-checked all connections just in case, (the case was not even open any more, so I am not sure how anything would have come loose). Tried starting again but same thing happened. Tried restarting about 5 or 6 times with the same results then all of a sudden, the next time I tried restarting it, nothing... no power to anything. Tried changing power cords. Didn't help. Re-checked connections again and tried 2 more times. Nothing. The next time I tried it, I had power again but still same as initial problem. I even swapped ouy the power supply to a 350 watt but same thing. Took everything off m/b including processor and re-built. Same. I tried again this morning. Completely re-built everything again with exception of pulling m/b out of case. Even tried to reset CMOS but no luck. I'mstarting to think either it's a faulty bios or cmos chip or the m/b is toast. I'm kind of desperate as I'm building this for a cousin and it was working when he was here on Sunday to look at it. Please help if possible. Thank you.