hey, i finally got my friend to update his ugly celeron (2.2GHz) to a p4 (2.8ghz northwood) both are 478 pin. when i switch the cpus i turn on the computer the power led is red, the fans spin and the cd drives blink, but nothing else happens no angry sounds or beeps. i put the celeron back in and it boots regualry, i then looked for a bios update there was one i updated it, still nothing put back in the celeron, and it boot with the new bios again. so i dunno i dont think its overheating how can it overheat right away before anything, and i have a new fan on it too, i just dont get it. please help. MoBo: p4vmm2 v8.1 (bios 1.1f) Ram: 1GB CPU: 2.2 Celeron (trying to get 2.8 Pentium4) HDD: 80gb GPU: ATI 9550 PSU: 200w (maybe this is the reason?)

That system was perfectly matched just the way it was...crappy CPU, crappy motherboard, weak video card, weak PSU. Why'd you go & mess with it? lol I sure hope he didn't pay much for the CPU. If it's a used P4, are you sure it works? Did you try resetting the BIOS (clear CMOS)?

ya i did, and i paid almost nothing for the cpu, and it does work. i think maybe the PSU is under watted (if thats even a word) its only 200w a celeron maybe able to use it but maybe not the P4??

It *may* be the PSU but I wouldn't run out & buy one without 1st doing some trubleshooting. Do you have one you can try temporarily? Are you sure the board supports that CPU? Did you check the CPU support list? Are there any jumpers that need to be configured or are all the settings in the BIOS?

i am guessing the p4 cpu is 533mhz fsb but it could also be 800. it will say on the top surface of it. The celeron will almost definitely be 400mhz fsb - it will say on top. i have not checked motherboard spec but will it do 533 or 800mhz fsb? or is 400mhz fsb the top speed of that mobo? also it needs to be able to do the correct cpu voltage, does the bios update say it fixes compatability with that cpu? If it is a good PSU then 200watts should be fine. Dell Optiplex GX270 small form factor PCs often have p4 2.8mhz CPUs and thsoe PSUs are only 180 watt. I think the HP/Compaw D530 which has same CPU only has 150 or 160watt psu. Just because a socket 478 cpu will fit in the motherboard does not mean it should work

and it should not overheat too quick to stop booting. even with no heatsink on they will boot before the thermal cutout kicks in (not reccomended)

i checked all setting before buying, the CPU is 533, the max the mobo takes is 533 with or without HT, my CPU is on the compatability list, im going to try to clear the cmos again but when i restart im going to put in the 2.8 right away see what happens, about the PSU i have another one its in storage tho so i cant get it today. anyways i will update with the results of my CMOS experiment.