power up no post

[junebug95628]

Hello,

I have read through [URL="http://www.webdeveloper.com/forum/showthread.php?t=137769"]


and have a similar prob, sorry for the long post but I want to give as much info as possible.

Have a ASUS P5P800 mobo and P4 3ghz processor in a pc that has been running fine for 2 years. The other day the entire screen was light blue. I rebooted the PC and had various problems occurring. After a few hours of trouble shooting the PC stopped booting on power up as it was supposed to as set in bios. Then it would power up but wouldn't post at all and no system beeps. I built another pc and put in the old hard drive, I was expecting to do a repair on windows and be good. That didn't work, seemed like the HD was corrupt or bad, reloaded the OS and has been working fine.

On the old PC, I thought it was the mobo that failed since the HD was working in the new pc. Bought a ECS P4M800PRO-M and installed with the old P4 processor, Kingston RAM, PSU and case. Tried to boot and had same problem. It powers up but no post and no system beeps. Tried a PSU that I had laying around, same prob. Must be processor, bought a new P4. Since my old ASUS P5P800 is a better board then the ECS P4M800 I installed the new processor in the ASUS in the old case and PSU. Same prob, power up no post. Damn, put new processor on new board in old case with old and other PSU, all the same, power up and no post.....

I have been trying power ups with no peripherals ie. video, memory,drives disconnected. Trying to get any beeps to no avail.

Any ideas?? I'm lost

[bathurst_guy]

The motherboard.

[wh666-666]

The only way alot of the time is to go through part by part. So youve ruled out the hdd and mobo. That just leaves the other parts, fun! So are you getting a blue screen of death? We need the info off that. If your using XP go in to control panel, system, advanced tab, system recovery and untick the option restart on system failure. Next time you see a blue screen it will say there is an error (possibly with a file) and stop code (eg: 0x000f100, 0x0003e000). Note down both the error, file and stop code entirely while the system is halted on that screen. Will help alot in narrowing down the problem.

Trying with that new mobo does it have onboard vid? Plug that in and disconnected the vid card. Run the computer with your RAM in and use a bootable program called memtest. This will check your memory, any errors after a couple hours and that will be your problem. If you get an error go through stick by stick to find the faulty stick/sticks.

Another thing is the PSU, this could be failing to put out enough voltage. Depending on your loaction you can pick up a psu tester, newegg have them starting from $10. The digital ones are the better than the LED only ones because they tell you the exact voltage of each rail.

Anyway im willing to bet its the ram or psu.

Linky to download memtest:
http://www.memtest86.com/download/memtest86-3.3.iso.zip

[junebug95628]

T So are you getting a blue screen of death?


No actually I wish I was getting that far. It powers but no post.

[junebug95628]

The only way a lot of the time is to go through part by part.

Yea, that's what I've been doing. What I'm afraid of is that I fried the new mobo with the old processor.

[wh666-666]

Its virtually impossible to fry a mobo with a defective processor. The only way that happens is not aligning the cpu properly, thermal compound over the pins or too near the edge of the top plate and heatsinks not being attached properly.

Good luck testing the ram and psu. If another board has been definetly fried it would seem to be more a defective psu.

[junebug95628]

I took the new mobo into Fry's and they stuck another proccessor on it and verified the mobo is dead. I exchanged it for another, put it in with the new processor and spare PSU. It booted, I put in the old processor in and that booted. So I think wh666-666 is correct, the PSU is taking out the boards.

I'll pick up a PSU tester tomorrow, verify and post the results. Thanks for the input!!

Jon

[wh666-666]

No probs, good luck in getting it sorted and it will be interesting to see the readings of the old psu, must be majorly kicking out too much voltage to fry a mobo almost instantly!

Just in advise to psu's, as ive said before id recommend one with digital readings because the ones that just light up will show PG (power good) with an allowed variance of 5% on the +5v, +3.3v, +5vsb and a 10% allowed vairiance on +12v1, +12v2, -12v. So even if the +12v rails have a 9% discrepancy it will still show as PG. PSU's after a while will start to fluctuate maybe 0.1v or 0.2v but if you take regular readings with a digital one and it starts to get more and more i personally replace before it frys other parts out. Also if you dont have a surge protector its a good idea to consider one to protect the psu/system agaisnt power spikes.