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Buzzing motherboard

I have just assembled my first PC (Foxconn micro-ATX motherboard, Rosewill 450W PSU, GeForce 7600GT, 2x512MB RAM, 120GB HDD). I connected everything to everything else, then installed the power supply. I made all the necessary connections except for the ATX 12V connection on the motherboard to the PSU. It was an 8-hole connection, but the PSU didn't have anything like that. It had a 6- and a 4-pin connector, both of which fit, but I ignored it. I also did NOT place washers or anything between the motherboard and the case.

When I plugged in and turned on the PSU, there was a buzzing noise around where the motherboard connected to the PSU at the 24-pin connection. When I turned off the PSU, the buzzing persisted for a second, then went up in pitch and faded out. I tried this a couple of times, achieving the same results, then disconnected the 24-pin connection. I turned the PSU on, and nothing happened. Then, I reconnected the motherboard to the PSU and turned on the PSU again. Nothing happened. No buzzing. Now I can't get it to do anything at all.

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Check and recheck

In reply to: Buzzing motherboard

Recheck all your work, you may need to disassemble to do that. While you may not need washers on the posts, verify that those posts are located on solder pads, metal-to-metal contacts. If not, then a fiber/paper washer should be used at weaker non-metallic mounting points.

The noise is probably from some capacitor its about to blow or close to it as it tries to maintain its voltage levels. -OR- its some fan that vibrates or seems to as its loose the same for any other loose mounting or device, they need be snug but not over tighten.

As for the power supply/PSU its has caps as wells, so be sure all those connectors are properly used. No, not all connectors are used as some are required for different uses and yours may not need them all. Just be sure what those are and verify the 115/230V selector the PSU is at 115V(in USA?).

tada -----Willy Happy

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Follow up

In reply to: Check and recheck

I've been staring at the thing for hours and I can't see anything wrong with the connections other than the ATX 12V thing I forgot/avoided. The noise couldn't be a fan because nothing like that ever came on. While the buzzing was happening I never even tried to boot the PC; I just turned on the PSU. Apparently, the second ATX 12V connection I was worried about is solely for the CPU so I'm not too worried about that. I'm also positive the 115/230V switch was at 115 since I am in the USA.

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Troubleshooting

In reply to: Follow up

Let's be bunt, did you check the 115/230V switch is at 115V? Your answer doesn't imply that with any certainly, if you placed it in 115V mode.

Unplug all devices and leave only the mtrbd. power attached. Now turn -ON the system. If it makes noise then, you have either a bad mtrbd., PSU, or the wiring is screwy. You don't even need the cpu installed at this point either. Again, if the noise appears, get another PSU for testing or return/swap it. If it starts or acts different, noise gone, attach device one plug at a time(shutdown and attach) until either the noise appears or seems to go away.

Understand, it maybe too late already, if the problem got hold of something and caused a failure, if you get good parts and the noise goes away but the system doesn't boot-up.

tada -----Willy Happy

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Not sure what you mean by this

In reply to: Troubleshooting

"I also did NOT place washers or anything between the motherboard and the case", Surely, you used the spacers (stand Offs)that came with the case, and checked there is not an extra one that is shorting out the board.

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Replaced

In reply to: Not sure what you mean by this

About the spacers/washers, just saying there was nothing between the motherboard and the case.

After speaking with several technologically inclined friends, I was informed that it was most likely a short and sent the board back. I bought a new Asus board with an LED that indicates if power is flowing. Now, when I hook everything in (including the ATX 12V) and make sure that the board is properly separated from the case, the LED comes on when I turn on the PSU and there is nothing strange like buzzing, but when I try to turn the PC itself on nothing happens. There are no noises indicating incompatible hardware, the BIOS does not appear, and no fans turn on indicating that the PC might be working. All I get is an LED and silence. I have tried using the Reset switch in place of the Power switch, assuming it might be a faulty Power switch, but nothing happened. I have disconnected and reconnected everything, and stumped all of my friends.

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T/S'ing

In reply to: Replaced

Take out of system case the mtrbd. Disconnect all devices and place mtrbd. and PSU on cardboard plug-in only the PSU to mtrbd., short the power-ON sw. pins for a moment(use a small screwdriver), what does it do?

tada -----Willy Happy

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It works!

In reply to: T/S'ing

Wow, so it was the case after all. Thanks a lot Willy!

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