T400 type 2768, Internal Speakers do not work? Here's what I have tried.

Hello all,
I just spent hours reading all the problems people have had with their thinkpad internal speakers not working. I bought this computer, which is past the warranty date, and am trying to fix it myself. It originally had Vista installed, and was upgraded before I bought it to windows 7. Once I updated the driver for audio, the three audio buttons began to work, but not the speakers. The headphone jack does work, however? Here is what I have done to try to fix this based on what I read on past posts in this forum:
updated windows, installed over 72 files
updated lenovo drivers for windows 7, installed 132 files. Not all applicable. Just covering my bases.
rolled back bios to default setting
uninstalled and reinstalled audio driver
updated BIOS again
installed new speakers. Old ones looked fine. No melting, pinched wires, and the inside of the laptop looked fine.
inserted headphones in and out several times to see if the audio is interupted by cutoff there. Sound was fine in headphones, but nothing happened. No noise or static or anything.
I read that this issue could be a motherboard problem? Every diagnostic I ran indicates that the sound is functioning normally. I need to know what to do next. I feel like I got took, but do really like the computer.
Can anyone help? Thanks.

If Eric's suggestion doesn't work, open System Preferences, go to "sound" and check to see of the mute button is not checked. Also check if the output name is "digital output" rather than "internal speakers" If it is, then it maybe it is the logic board, which it was in my case. However, it was covered under my warrenty. My sound problem came from a faulty logic board that was replaced in my computer for a "non boot" problem.
Good luck

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T400 type 2768, Internal Speakers do not work? Here's what I have tried.

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