BIOS boot problems

for a while my PC was working perfectly but all of a sudden it wouldnt boot up. i reset the bios using the jumpers and it boot up fine and it worked for a week and then i had to do it again. i thought the battery was dead so i chnaged but that made no difference and now i have to reset the BIOS every time i boot the computer up. also even if i just change the time in the BIOS, the PC wont boot up and then i have to reset the BIOS again. no matter what i do, reset or shut it down, the PC will not reboot untill i reset the BIOS. there is no warning beeps or anything either, all parts work in other computers.

mo/bo – K7T turbo2
CPU – Duron 1.3GHZ

TIA