CentOs, Tells me they did not want support. The Snap HW is very specific. This thread is where a user loaded FreeBSD on a 4500, had flags that needed changing inorder for it to work with the ServerWorks Chip. The same may apply with the 4200.
http://forums.procooling.com/vbb/sho...highlight=4500
I was suggesting use the direct video and KB vs going through the com port.
My guess at this point is that you may need to reset the BIOS back to defaults, then change/verify the boot order. Thinking that it is trying to use the SCSI as a boot device.