"Should I just unplug the drives from this one and let it run in the new one while I figure this out?" You should be able to, if you like.  IF YOU ARE SURE that RAID was not installed/enabled on the original machine, then you should be able to do this without a problem by setting the Embedded SCSI to SCSI Enabled. Is your LCD panel amber and scrolling and error message(s), or is it blue? You might try clearing the NVRAM using the jumpers on the motherboard near the system memory.
Hello everyone  I came to work this morning and found our SQL server dead. On the screen it's stuck at the mptbios and it won't spin the devices. There's no raid setup on it, they're pure SCSI from the BIOS. Can't even get into the bios, can't boot from the CD, nothing. I've noticed that even loading the bios and getting to the lsi mptbios is taking longer than usual. I might be wrong though. I've taken the drives out to see if I can get past that screen, with no luck , the mptbios is searching the luna's, can't find anything, because there aren't any drives in and it just stops. Does not let me into the bios, nothing. I have currently 5 drives in it, 2x36gb and 3x72gb. One of the 36 is the os itself the others SQL db's and logs and 2 are empty I believe. I have however another pe2850 with the same lsi mptbios on it, I think the CPU is not the exact frequency but other than that they match. Should I just unplug the drives from this one and let it run in the new one while I figure this out? I've looked everywhere for an answer couldn't find anything. It just died last night, I found it like that in the morning and there was no power outage or anything. Any advice? Thanks for reading my post. 
PE 2850 stuck at mptbios 5.06.06, not booting