|When a computer starts making a noise, that is the time to investigate. Had this been me, I'd have opened the case immediately upon detecting a noise, with the computer running, and figured out where the noise was coming from.|
The last time this happened to me at home, it turned out the case fan bearing was going and that was what was making the whine. Simple enough to replace.
Anyhow, having said that. You still don't know what was making the whining noise. It may have been an HDD or it may be a fan (case, CPU etc). Since you don't know that, you'll have to troubleshoot what you do know.
The inability of the system to find chkdsk.exe is not a good sign. This may mean you do have HDD issues, or it could be OS issues, or, it could be a virus.
Loaded the XP sp3 cd into the cd-rom to try and do an XP repair and the initial load goes through but when it gets to the starting windows part it blue screens.
The exact error would be very helpful. It can be researched via google and there's a good chance that will lead you to the root cause of the problem.
As far as the RAID goes, is it a hardware RAID, or a software RAID?
If the issue is an HDD, and the RAID is a hardware RAID, there's a good chance the problem is recoverable. If the issue is an HDD, and the RAID is a software RAID, well, software RAID's aren't worth bothering with and the problem may be unrecoverable I'm sorry to say.
No matter what, I sincerely hope your hubby has proper backups going on for his system. A RAID does not preclude the need for good backups. Which btw, I hope you have good backups going on your PC as well.