Last week I "found" an unneeded internal speaker in a precision t3400 (had audigy x-fi upgrade). I removed this and have just tried to fit it to my precision t7400 (no audigy). Speaker slotted in nicely, plug fitted the socket labelled INT_SPEAKER under the cpu/memory ducting perfectly, and it even makes a tiny clicking noise when I connect it, but if I have no speakers/headphones plugged in either front or back socket, windows 7 just says no audio device plugged in and won't play anything.
Anyone got any ideas - doubt dell will support my system as I'm not the original owner and I'm fitting a part that came from a different model, and t7400 isn't on list of supported win 7 devices.
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