Hm... HDD activity LED doesn't seem to be working just yet.
So, either:
-doesn't work unless it's booted into an OS
-LED doesn't work
-HDD activity header doesn't work
-HDD doesn't work
-Hotswap bay doesn't work
-SATA port is borked...
I hope it's the first one. Or maybe second or third. Hopefully none of the others. ;n;
(I haven't actually got a spare monitor to plug it into yet, so I don't have much to go on)