My pc powers up but my monitor, kb n mouse dont work. Ive reset the ram n cleaned out everything. I also switched out the battery on the motherboard, but still no display on monitor, n no kb or mouse. The fan on my psu works. You can hear the sounds running like all is good, but its not. I tried the monitor with another pc and it worked fine. What could b the problem. Im running windows xp. motherboard is intel psu is okia 450w I dont have a manual for my motherboard n I cant even get into safe mode or bios. Please help!