U mean the POST not the BIOS, If your not getting to the BIOS anymore, then there should be something going on with the POST (power on self test), which happens initially when you star your computer.
Lets work together, See if this could help and please check.
check your display device settings and refer the manual if required.
do you hear a short beep when u switch your pc on?
maybe your monitor isnt able to show the POST, happens on the large screen LCD's when there is a resolution conflict. if you hear a long cont. beep then your RAM is faulty or loose.
checked the power supply ?
if no beep at all the retrace your wiring and double check it.
the video card could need an external power cord. check that.
double check the power chords running from the smps to the mobo. if you have made a wiring error or a short then sometimes the mobo doesnt power on to prevent damage or mayb it has already been damaged !
check the jumper settings and refer the instructional manual.
hope you had grounded yourself properly while wiring. static from your body can kill the chips it comes in contact with. keep your fingers crossed on that.
the fans work properly cause they are directly powered by the smps ofcourse unless you mean the fans that are connected to the mobo (eg.varying speed).
SMPS should be atleast 400W of true power.
you need to tell which video card you used , which display device you are using and your SMPS wattage and company.
also if you hear any beeps on power up.. long/short or any other pattern.
Edited by Yateesh, 18 May 2010 - 12:43 AM.