Pc wont starts or boot

hello friends
yesterday i start my pc go to bios and then go to frequency and voltage settings and there i change cpu frequency from 266mhz to 400mhz and restarts pc but it wont starts(boot).also no power to keyboard or mouse but lights on keyboard blinks for a second as i press start button on cpu.all fans are running.ram is working.graphic card and dvd also working.hdd is also running.no display on lcd monitor from cpu.
my specs are:-
intel core 2 duo e7400 2.80 ghz
graphic card zotac 8400gs 512 mb
4 gb ram
hitachi 500gb hdd
500w psu
simmtronics motherboard(dont know model)

thanks in advance for ur help
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  1. Try clearing the CMOS.

    This link might help:

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