I started getting SMART errors on the second drive in the system (WD2000 200Gb) and decided to replace it. I now have a replacement WD3000 300Gb SATA drive. When I install that drive, the machine (Advent T9301) fails to boot - it stays on the Advent splash screen, and I do not seem to be able to get into the BIOS. If I leave power connected but disconnect the SATA cable then the machine boots. I am a little puzzled now, as I had expected it would be a simple swap out - what am I missing?