[mythtvnz] Looks like my system drive is faulty - ideas?

[David Moore]

My system won't boot today unless I unplug the boot drive. Can't even 
get into the BIOS setup. Just hangs with no POST beeps/messages and the 
hdd led permanently on. So I can't boot into a cd to try and 
diagnose/repair the drive. I can boot a cd if I disconnect the boot hdd. 
Any ideas how I can get round this so I can try and fix the boot drive?