I bought a brand new Seagate 400Gb hard drive for my PowerMac G4 MDD FW800. I installed it in the back bay, as a slave drive. When I power on the Mac, I get a blank grey screen. The original hard drive with OS 10.4.11 is set as the master, so I don't know why it won't boot properly. I've checked for bent pins, and I don't see any obvious ones, so I'm completely confuzzled. Any ideas???