Hi, It appears your computer came with a 320 GB drive but 5400 not 7200. I would think the drive would be ok -- just noisy but am a little concerned about the clicking noise. If possible try the drive in an external case and if you still get the clicking you may have a bad drive. I'm including a url for your computer specs. Hope this has been of some help. Ralph

http://www.everymac.com/systems/apple/ma...-pro-core-2-duo-2.53-aluminum-15-late-2008-unibody-specs.html