I am confused. What do you mean when you say you used the info off the Rev? Do you have complete bare metal backups? If so, you could pop in an extra drive or, in this case, one of the drives that are empty, and be in business in about an hour.
I hate to say it, but you have to have an AVR/UPS on your main computer. One of the nice things about servers is they tend to have dual PSUs. Sorry, I know this isn't helping. But, with a .enc backup you can just restore to any of your clients and redirect the paths.
Again, as Sandeep says, we don't know if this is WIN 7, a client or a server. Then again, I think you were looking at servers.
This is where purchasing a server from say Dell, with ProSupport with NBD support 5 days or 7 days or mission critical 2, 4, 6 hour support. You really can't expect these Big Box stores to have the type of technical know how. I feel bad for you. A RAID would have been great here.
Why not install to one of the other two drives, then load AC on it or use your backup software to restore once you are up and running. All of your data will be back.
But, can you imagine having a Dell tech there in two hours with all parts needed? Sorry, I am probably not helping.