MacBook audio not working and computer running slowly.

lately, i have been experiencing audio issues and video issues. often times, the und icon in the menu bar will be grayed out. my computer has been running very slowly and i often have to hold the power button down to get it to work (temporarily).  i took it into the apple store and said it needsa new logic board.  i wanted to get a second opinion before i proceed.  thank you. 

No one here could possibly diagnose your MacBook better than the Apple Store, having drawn that conclusion after seeing it themselves.
The best diagnostic you could perform yourself would be to run Apple Hardware Test. Restart your computer while holding option D to run AHT, or boot from your original system install DVD while holding the D key.
If it reports "no problems found" then run the extended tests, which might take a half hour or more.

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