No sound no audio in Mac Mini Early 2006

I'm using a Early 2006 version of Mac Mini, I have upgraded the CPU to Core 2 Due 2.0Ghz, and ram to 2G. So it runs Mac OS X 10.7.5. Recently, I have no sound but used to have in the past. I've checked systems and I have no sound output. Output volume is grayed out and shows muted. Also on System Report, the "Audio" page is totally blank which used to show Intel HDA specs. I've tried resetting PRAM and SMC (twice)- that didn't work. I've tried plugging in speakers, headphones, etc. Doesn't work. Is this a hardware problem? Any ideas? I have not tried to re-boot from original optical disc and press C, but I will try to look for the old disc first.

I suspect you disconnected something during the disassembly/reassembly. Take it apart and check your work

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No sound no audio in Mac Mini Early 2006

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