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I have a new motherboard, MSI H81M-E33. The new case (cooler master elite 110) came with one of those tiny 4-pin speakers, as shown in my picture.

Everything seems to work fine, a fresh Win 7 installation boots without issue, but I get no POST beeps from the MOBO, and there is no sound in after booting-- Windows says that no playback device is available.

Headphones work fine, so it is not all sound, just the little internal speaker that isn't working. MOBO & Chipset drivers all installed & updated, and Device manager shows no problems with any devices.

The image shows the Mobo pins diagrams and the mini speaker. JFP2 is where I have the speaker connected.

So, am I doing something wrong, or is it more likely that its just a bad speaker?

enter image description here

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Are you sure you have the speaker connector the right way around? The Black wire should be on pin "1". That's assuming they wired the buzzer right. ;) You can safely flip it around and try it the other way without blowing anything up. –  Ƭᴇcʜιᴇ007 Mar 7 '14 at 16:26
Judging by their install video for JFP1 - I think that manual is wrong. What's the actual silkscreen label on the motherboard for that JFP2 connector show? –  Ƭᴇcʜιᴇ007 Mar 7 '14 at 16:34
I tried flipping the speaker, in case something was mislabeled-- no change. As for the video, it looks like that's MSI's generic how-to, the board in that video is not mine at all. The silkscreen on mine reflects the diagram above. –  Promethean Mar 7 '14 at 17:02
Could jus tbe a defective buzzer. I'd say try another speaker/buzzer, and/or try that buzzer on another motherboard. –  Ƭᴇcʜιᴇ007 Mar 7 '14 at 17:27
@techie007 I think your right: I'll try pulling from a known-good system –  Promethean Mar 7 '14 at 17:45

1 Answer 1

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It's hard to tell from the angle the picture is taken at, but it looks like the speaker's red and black wires are connected to the outermost pins of that four-pin connector. On the diagram, the speaker should be connected to pins 1 and 3, not 1 and 4.

If that's the case, you may be able to prise the pins out of the plastic plug and put them in the correct place.

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Browsing around the web, it looks like this 4-pin, 1 & 4, is the standard: 1 & 3 wouldn't send any power (VCC5) least for this board –  Promethean Mar 7 '14 at 17:43

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