PLayed with jumpers, now i am dead I was just playing with jumpers. and changed there their position to c what happens. On switching on the comp nothing happened, even the boot screen did not show . So i reset the changes i had made to the jumpers and now everything was working fine. However after restarting my pc (switching off the power as well) my mouse didn't work, pressing a key resulted in loud sounds from the cpu, and i couldn't acces the bios, though though the computer booted fine and i see the windows 'user welcome' screen. Now, i have to use this workaround to start my comp everytime. Chane the jumpers , power on and wait till i get the horrible noise, then switch off. Change jumpers back to original position and then finally reboot. This works but the bios gets reset everytime and i get his something like this. So basically i have to switch the jumpers twice, in order to boot. Jumpers: 1 -near the cpu, i don't thnk this is causing probs. 2-near a pci slot, changing this gives me the blankscreen 3. near the cmos batterty and bios. My pc: PIII 550Mhz, award bios , 256mb Ram, xp, Procomp BST1B-E mobo . All comments, help are welcome. P.S i have updated my bios as well- still doesn't work. plz read my 3rd post- i have really nailed the problem.