Hi all.. am new here. After a year of using my mobo, I came into this problem with my P4s333-M 256DDR 64 Mb Geforce P4 1.8 Ghz As part of maintenance i clean it every other 3 months or less using a blower. I removed all parts/peripherals (including removing heatsink, cpu ,hdds, memory and vga) for cleaning then put everything back in place.. When i power it up after cleaning, it won't POST This is my 3rd cleaning, and it's the first time i ever encountered this problem.Prior to this board i've cleaned 3 PCs too at the same time and the other PCs is ok. I rechecked all the jumpers(thru manual), reinstalled the cpu and heatsink, the board powers on, power led and hdd led lights up. I checked my (suspected) PSU by swapping it on my other computer's PSU (with the 12V/4 pin connector too) . The suspected damage PSU is ok when used on the other PC. Everything seems to be fine (mobo leds lights up), fans are spinning, but can't seem to get POST. I've also tried resetting BIOS but still no POST. There are no error beeps when i remove the VGA card and memory module. Could it be my cpu is damage or my mobo (hope not )?? how can it be damaged ? I need some help pls.. P.S. sorry for the long post.