I had a new hard drive installed at Apple today because my previous one was failing. Before Apple took my machine, I backed up to my WD 3200BEV external hard drive. Today, I plugged in the WD and it isn't mounting. The WD does show up in the System Profiler (under USB) and in Disk Utility. Any suggestions? Vitals: MBP 15", Late 2008 2.4 GHz Intel Core 2 Duo OS X Lion 10.7.2 Thank you.