Please Help: New build keeps rebooting

[andrei3333]

Worked fine for 3 days
e8400
ga-p35-ds3l
2x1gb corsair 4-4-4-12
ocz stealthxstream 600w
7800gt
7200.11 hdd

installed xp, updated, uploaded some of my software, went into bios changes the memore timings to 4-4-4-12 and increased the option called DDr218 or something like that - from by +0.2 because it was showing 1.873V and my merory says 2.1 Volts

it worked rebooted, then it got stuck, i rebooted, then it got hung up again after a few minutes, now it keeps rebooting every 3 seconds, i tried clearing the bios by shorting the jumper with a screwdriver, and by removing the battery for about 10 seconds..and same thing, i turned off the PSU and looked at the MOBO, i dont see anything burnt

what to do now

 

[jkresh]

rebooting after 3 seconds sounds like you have a short. It it is really every 3 seconds then look for a short on the board (or how it connects to the case), also why would you use a screw drive to short the jumper? You usualy just have to move it from 2-3 to 1-2 or something like that (try that and try with the battery out and power unplugged for 20 minutes)).

 

[andrei3333]

ok i took out the batter for the whole day while i was at work, same thing, i replaced the ram put in my older ddr2 533 mhz 2x512, same thing, put the ram into different slots same thing

i cannot access bios, it keeps rebooting every three seconds, turns on shuts off, and keeps doing that

there is no switch on the cmos, its a 2 lead jumper

 

[andrei3333]

anyone please

how do i know if the cpu is dead
how do i know if the mobo is dead

all the fans spin and leds come on while this is happening