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Please provide us more details.
- Who did the work, and why can't they fix this for you?
- is it the exact same vintage logic board?

Genius Bar did the repair.

As for the logic board, I have to assume it is since Genius Bar did he repair.

Why can't hey fix it for me, I haven't brought it back to them since they installed the new board.

This is a mid 2009 2.53 ghz machine bought in december 2009.
 
Ensure that the system knows which boot drive to look for first.

System Preferences > Startup Disk
then select your hard drive.
 
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