Ok I'm running a gigabyte mobo (model 7nf rf or some such i believe)
512mb ddr400 ram
128mb nvidea mx4000
twin 80gb HDs
win98se
AMD sempron2400(1.67ghz)

i was playing with the bios(/cmos?) overclocking i changed the proccesor from 166mhz to 200MHZ and the memory to %120 hti save and exit. computer will not reboot gives me a blank screen and gives one 1.5 or so second beep about every 3 seconds. i have tried putting the jumper on the CMOS_CLR (with power CORD unplugged). i've also tried leaving the power unplugged overnight and the CMOS battery out. Things have not changed at all. i would really appreciate any help i can get, am i possible going to have to get a new mobo?Did you try putting the jumper on the cmos - clear while the battery was out?  Might try a different memory module if all else fails. Or remove 1 at a time if you have more than 1.just one stick of ram, i'll try the jump and BAT thoughI don't know if the beeping would be translated as 1 beep or continous beeping.... But, on most mainboards they both indicate a memory problem. The continious beeping could also be a video problem. My bet is you fried the memory stick. Perhaps borrow one from someone to see for SURE before you buy another.There is a lesson here about overclocking if you don't know what you're doing.