A loud pop noise

Ok, So when I was doing a CMoS reset, I did everything according to this guide. Turn off PSU and unplug, then take out GSU and sound card. After that I unplug the power to the motherboard. Took out battery, waited 30min then put back in, then put jumper to enable. Press the reset cmos button and put everything back. When I plugged the PSU and press the switch to on everything seemed well. I pressed the start button and a loud pop. So I just turned off the power. I saw no smoke or anything. Sniffed around for an aroma but got nothing.

Nvidia 9800GTX+ 512mb
AMD II Phenom x4 955 BE
Asus Crosshair III Formula
WD Caviar black 640gb
OCZ ModxStream pro 600w PSU
4gb (2gbx2) A-Data Pro gaming memory DDR3 1600

Anyone have ideas to what that noise came from?

I returned the motherboard and processor.
It was a successful return. Got the same processor and switched the motherboard. Everything else is the same.

Now I'm pretty scared to put the computer together.

First time making a computer and is very nervous of breaking it.
3 answers Last reply
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  1. Sounds like a capacitor blew. Hopefully it was on the motherboard so you should be OK to try again.
  2. Possibly could have been some capacitors popping due to a short somewhere in your system. Does your PSU power on? You can test it out of the system by bridging the green, as well as a neighboring black wire on the 24-pin connector.
  3. You can do a quick check of the PSU. Use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

    The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

    You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.

    This checks the PSU under no load conditions, so it is not completely reliable. But if
    it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

    Then breadboard the system (build it without a case) to test the parts.

    You can build it in stages, step by step, testing as you go.

    Then before you start putting components in the case, take a look at this thread:

    The checklist at the beginning of the thread may keep you from making common mistakes that many builders make.
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