Software RAID1 - Failed Drive Issues

Our SBS 2003 server has been failing lately, with some random reboots and lockups.  We have 2 IDE drives in a software RAID 1 for the OS (the array I'm worried about), and 2 SATA drives in a RAID 1 on a physical card.  I tried a different IDE cable already.  When we tried booting to each drive individually, one drive wasn't recognized by the BIOS or anything, whereas another one would start to load SBS 2003 but would hit a BSOD [Stop: 0x7B].  

We are getting a replacement drive right now, but which drive do I clone?  We are okay with being on just one drive (not in an array) for now, as we will be migrating to a new server after this fiasco, I just need to have the OS booted to move over mailboxes, etc.  I am just worried about this whole software RAID.  I'm used to physical cards.  With a hardware RAID, you can still boot after removing one of the drives.
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Do you have routine backups being performed or are they all failing?

Can you post the contents of boot.ini from your c: drive?
hvconsultingAuthor Commented:
Our backups had been failing for a long time [ntbackup] but we should have most/all of our stuff on Carbonite.  I will see if I can view the contents of one of the hard drives to see what the boot.ini says.
Did you check the drive which the BIOS couldn't see on another PC? IF you can see it on another PC either, it is bad and then it is also clear which you should be replaced.
hvconsultingAuthor Commented:
I ran Seagate's SeaTools diagnostics on the drive that BSOD'd and it came back clean.  But then I tried sticking in the new drive with the drive that wasn't recognized by BIOS, plus replaced the CMOS battery (this may be key) as per a voltage message on boot, then it's booting into SBS 2003 fine now.  I initialized the new disk and it let it be part of the mirror OK.  Looks like this issue is resolved for now, but I'm going to keep this question "open" for the rest of the day, as I will still be working on getting everything back up and running.  Thanks.

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hvconsultingAuthor Commented:
Accepting my own answer because I figured it out on my own, with no help from other answers.
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