i bought a computer in nov, it has a bay for an HP personal media drive. after procrastinating i finally bought one...500gb. NO instructions came with it. after talking to hp help online, i found the instructions to put it in. HOWEVER... although i have put it in correctly, (the light flashes yellow, then changes to solid green/aqua), my computer does not "see" the drive. so the instructions on HP telling me to open the PMD don't help. is there something else i am missing?