My Problem

I had a 320 GB hard drive earlier, it started getting full too easily & stalling the laptop whenever I ran more than one program (photoshop, autocad, etc). So I changed both the hard drive and upped the RAM.

My Fix

Pretty easy. Used SuperDuper to back up data then installed the hard drive using the guide available.

My Advice

It's a good chance to clean up the insides once you've popped open the cover.