Specs, Asus P4s533-VM 160GB IDE HDD 1GB DDR Ram Celeron 1.7 GHZ CPU 300Watt PSU I have an ASUS P4S533-VM Board. I originally had a Celeron Socket 478 1.7GHZ Cpu on the board. i wanted to change and i put in a pentium 4 3.0GHZ Socket 478. When i started up pc, all that went was the cpu fan for a second and stops. The green led on the mobo stays on all time when power is in. I tried putting the old celeron back into no avail. Removed all peripherals except ram, still no good. Tried different PSU. Cleared CMOS, changed Ram configuration, kept ram out, done all, but still no booting sequence at all. Can anyone help me please?