|I'm trying to diagnose a problem that appears to me to be some kind of electrical short, but I'm not sure.|
Here's what happened:
I was rendering a vid in the background, and watching a youtube vid when my computer just shut off. No strange sound, no warning, it just went dead.
But I need to backup. A couple days ago I just put my build into a new case - the Fractal Design R4. Today I was trying different drive configurations to get the best cooling. I had moved the drives around to different bays until I found a sweet spot. My drives dropped from near 40C to between 27 to 30C - which seemed like a lot to me, but hey I figured everything was good. Now I'm thinking the excess heat originally may have been due to an electrical problem, because this figures in later.
After the computer died I just tried switching the PSU off and back on from the back and pressing the computers power button. Nothing. The PSU is a SeaSonic S12II 620W Bronze. I tried the obvious stuff ... unplugged from the surge protector, tried a wall outlet, different psu power cable - all did nothing. My USB backups and monitors were working off the surge protector so I knew it was good.
Then I removed the PSU and tried the jumper trick on the 24 pin connector. It came on.
When I put the PSU back in, and reconnected everything, the computer wouldn't turn on again .... at least not the first time. About the 5th or 6th time trying it from the case power switch it came on briefly and then went off. I disconnected everything except the 24 and 8 pin power and it came on and stayed on. Thinking this might be a problem with either the 3 or 5 volt rail I decided to try another PSU- a Cooler Master GX 450 W Bronze that I absolutely know was working form another build. The Cooler Master has only about 3 months use on it. I plugged it in with just the 6, 8 and 24 pin power and tried it and the computer came on by pressing the case's power switch. But when I hooked up the drives, the monitors, USB peripherals etc, it wouldn't turn on.
I disconnected the monitors, and peripherals and tested it on my bench. It wouldn't come on. I disconnected everything except the 6, 8 and 24 pin power and it came on. Same as with the Seagate PSU. This time I started to reconnect things one by one. Eventually through the process of elimination I discovered that If I plugged in one of my HDD's - a 3 TB WD black - it prevented the computer from coming on. Just to check this theory again, I reconnected the 3 TB drive and turned the power on. It powered on, but there was an instantaneous puff of smoke from the 3 TB drive (goodbye 3 TB WD Black drive), that horrible eclectical smell, and the computer shut down. And I immediately pulled the plug.
So leaving that drive disconnected and the Cooler Master GX 450 PSU connected I tried it again. It powered on as normal with my three other drives connected. I reconnected everything - two monitors, 3 USB drives, and all temps good and running now about an hour. But I'm worried this is a larger problem.
I've never heard of an HDD causing an electrical problem, shutting a system down and then preventing it from starting. I guess if the wiring is bad, but...? So I'm thinking it's possible there's a short somewhere, and that something else might be next.
When I mounted my mobo in the Design R4 case, the mobo had one odd stand off hole, with no corresponding hole in the case. I measured and drilled one and it lined up perfectly and I was able to thread the stand off in tightly. The bit I used was smaller so it took some effort to thread it in,. so it's tight. But is it possible that this could be the cause of a short?
Also, with the drive sleds, there are large head mounting screws for the drives as the drive sits on a rubber grommet. But the screw thread bottoms out in the drive before the drive is secured. That was the case for all 3 of my drives. Weird design. So I put a tiny metal washer between the screw and the rubber grommet - not contacting the drive. The washer touches nothing else in the case - not even the drive sled. Just the mounting screw where it seats against the rubber grommet. But would this cause a problem?
I've yet to pull this apart yet again, and retry the 620W PSU without the faulty drive (which I now consider a dead drive). But that's next
So what's going on here? Could it just be that drive, or are these symptoms of a short somewhere else and I'm playing with fire even running this right now?
message edited by Tim_B