Several weeks ago I posted in the Software section that my MPB (2009) was having trouble reformatting/erasing/restoring/installing OSX on my new internal mac-compatible HDD. Still I was able to reinstall OSX on my external and work from there. I never did resolve the problem, and now it's gotten much worse: my MPB doesn't detect my internal HDD at all. Only my external HDD and optical drive shows up on Disk Utility and System Profiler. I've been hoping someone will be able to diagnose the problem. I can't help but suspect the worst: is this a problem with my logic board?