Bend to Startup.

Just curious to know if anyone has had this problem--I have to twist my 2008 Macbook Pro 15in to get it started. Then will shut down when moved. I took it in for repairs but no luck. They tried to replace the board that controls the power, did not work. Any info would be greatly appreciated. Replaced the hard drive and got a new battery not to long ago, and would hate to have to buy a new computer!