PSU 3v grounded to case

Hello, let me first explain what happened. I went to start my computer the other day and nothing happened. So, I went to check the switch on the PSU and that's when I felt the tingling on the side and back of the case. I pulled the plug, took out the PSU, and tore it apart. That's when I found the gunk connecting the 3v to the ground.

I've replaced the PSU with one I used to have in the PC and even checked it with a multimeter to make sure it was still good. Then I checked the board for smells, burning, bad capacitors everything looks good. So I plug everything back in except the mouse,keyboard, and monitor leave the case open (no safety switch ) turn on the PSU switch and the green light on the board comes on. Here is where it goes south, when I hit the power button on the front it only runs for maybe 1/5th of a second. Enough for the blue LEDs the flash on my CPU cooling fan and that fan plus the one on the PSU to spin once.

I've checked the power button, swapped out the hard drive, and pulled out the RAM sticks and tried them one by one. I don't have a spare board, CPU, or RAM so I thought about buying a POST card problem is I've never used one so I guess my main question is will less than a second be enough time to produce a code? Does anyone know something else I can do besides buying new parts and hope I get lucky?

Thanks for taking the time to read this and possible help me out. I didn't post any specs but can if somebody thinks that'll help.

 

Hmm, since you put back your old PSU, that begs the question of why did you replace the supply in the first place? If the old one was going out, why would you expect it to work now, especially if you added/upgraded hardware? You're right in saying there was a short but I would never open a PSU even if I knew my way around. The tingly feeling would have warned me straight away to stay away and throw it away.

EDIT: BTW, for the uninitiated, there are dangerous voltages stored in those capacitors, just throw the damn thing out.

 

Well you need to double check that power supply is ok really but you could try pulling out EVERYTHING and just fire up the PSU and MOBO. The worst you'll get is error beeps and this will narrow it down to those two components.

I would put my money on the Mobo being fried though if it was pumping volts through the case.

 

I've only had two mobos that ever had a built in speaker along with no cases having it. Are pre-builts better in this respect?:confused

Oops! Sorry for the hijack.:-o

 

Hi, as others have said the power supplies you are using are suspect. One thought is that whenever I have a POST problem I clear CMOS. Usually, I unplug the PC and remove the battery for a minute and then put things back and try to POST. If no change then I try with no battery. For some reason, I have luck even though the CMOS settings themselves aren't the problem.

 

From the symptoms given the machine is barely even posting, i can't think of any setting that will make the machine power off so quickly... if however nothing else works then i guess its worth a try

Most of the PCs ive fixed ect, have a speaker in the case, can't say i can ever remember one with a built in mobo speaker lol.

I generally carry one in my tool kit incase i run into issues and the pc doesnt have one installed.

 

Reason I replaced the psu before had nothing to do with it being faulty. I used to run 2 video cards in Crossfire and planned on adding a few more things. I switched to a single card and went with a PSU more suitable for my system. I've tested all the pins and they have the correct voltage. I even checked the pins for shorts and grounds.

I did try resetting the cmos, I pulled the battery and moved the jumper to reset it. No luck.

The case does have a speaker and there is a plugin on the board. Sadly it isn't putting out a beep code. I also tried unplugging every thing but motherboard CPU and CPU fan. Same problem so one the other or both are probably fried.

I guess I'll be buying a new mother board and if that doesn't cut it also a CPU. Then hope for the best. Thanks for the replies and I would have done quotes but I'm typing all this with my phone, lol.