my buddy is working on fixing a cusom built pc and is having a bit of a problem. it's got a new mobo and a new processor but it wont boot.
everything connected to the mobo powers up fans,hdd,dvd-rom,video card,ect,ect but the processor wont post. asif its not even there. everything in this pc but the hdd has been replaced. but the processor still wont post. im thinking it could be 1 of 2 possibilities.
1. all the aux power inputs on the mobo need pluged in because its not getting enough power to run everything.
2. or more likely the processor wasnt seated properly and or is fryed.

aneyone else have this problem? what can i do to fix it?

I don't know how many times this needs to be said...ALWAYS benchtest a board before installing it a case!!! Now you have absolutely no idea what's causing the problem. Disconnect everything, remove the board & start from scratch. Lay the board on the bench, make sure the CPU & HSF are properly installed...install ONE stick of RAM...install a video card & connect a monitor...plug in a keyboard...then connect the power supply making sure ALL plugs are connected. Use a screwdriver to momentarily connect the 2 pins that the start button would normally connect to. If it fires up & you get a display, obviously something was connected wrong in the case. If it doesn't fire up, you've narrowed it down to a handful of possibilities.

hi
by "POST" do you mean XP post boot or do you mean you cant even get into the BIOS etc
Damian

Pentium 4 3.2ghz @ 3.5ghz
Nvdia4 Mx4000 OC@ 350/500

wont post as in cant even get into bios. the pc powers up and all the components power up and run but no beep like you normaly get when you turn on a pc.

Gut the case & start from scratch! You don't need HDDs, optical drives, sound cards, modems, etc to get the board to POST. And are you 100% sure that there isn't a standoff (board support) that's shorting out the underside of the board? Take the board out & benchtest it! It's the ONLY way.....

yeh do what "jam" says and if still no luck i would suspect Vid card for no display try changing 4 another if not delve deaper into the system and check Mobo jumpers also another thing check your clear COSMOS jumper as that will stop pc from even startign up to BIOS
GOOD LUCK
Damian

Pentium 4 3.2ghz @ 3.5ghz
Nvdia4 Mx4000 OC@ 350/500

th eproblem is the video card or motherboard. When i made one myself, it had the same problem. It turned out to be the motherboard originally, but when i bought a new one, the video card gave out after boot.
After that first time, it wouldn't boot again. blank every time i hit the power.
try pressing power, waiting a few seconds, then re-press it, holding it down until it turns off, then unlug the power and press power again. it should briefly turn on. wait 20 seconds, try pugging in again and booting. Sometimes i have had the cmos clear it self when doing this.