Dell Poweredge server unable to boot into Windows after disk failures on D: drive (non os)

We are having an issue with a Dell Poweredge booting after replacing 2 failed disks.

The 2 disks that failed where in a Raid 5 and contained just files and folders for the shared drives. The OS was installed on 2 drives mirrored both of which where fine and with the failed disks in the server was able to boot.

We replaced the 2 failed disk in the raid 5 and deleted the existing logical disk that had been created and created a new one with the new disks in the Dell raid utility within windows. This created fine and we where able to then restore the backup to these drives (D:) and all has been fine for the last few weeks.

Until the server unexpectedly shutdown due to a power failure onsite, now the server is refusing to boot to the OS saying its unable to boot and to enter a boot cd dvd/usb.

Any ideas would be great
Ben CampbellIT User, Manager, DiplomatAsked:
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noxchoGlobal Support CoordinatorCommented:
Are you sure that your OS was installed completely on MIRROR RAID? What exact error do you get?
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Ben CampbellIT User, Manager, DiplomatAuthor Commented:
100% the OS is installed entirely on the Mirror as when the failure occurred on the other disk we actually removed all the other disks (the 3 in the Raid5)
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noxchoGlobal Support CoordinatorCommented:
Ok, then Windows load process - till which stage does it get?
Also, was any setting changed in BIOS after the failure with RAID?
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Dirk MareSystems Engineer (Acting IT Manager)Commented:
Can you boot into Safe Mode?
Have you tried running Windows repair (does it detect the windows installation)
Have you removed any other devices from the server (USB, eSATA)?
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DavidPresidentCommented:
RAID doesn't protect against data loss in event you lose power.  You need to take the RAID out of the equation and deal with it like you would if you had a single physical disk drive and system lost power ....  

Use the windows recovery disk, then kick off a data consistency check.  (Then buy a UPS if you want to prevent this from happening again)
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PowerEdgeTechIT ConsultantCommented:
So, after replacing the bad disks in the RAID 5, it ran ok for "weeks"?  If so, then this is unrelated and you have a new problem.  If this is the case, then I agree with dlethe - you need to repair your OS and better prepare for power outages.
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Ben CampbellIT User, Manager, DiplomatAuthor Commented:
I've requested that this question be deleted for the following reason:

Engineer has left and the issue has been resolved.
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DavidPresidentCommented:
You wanted to know what could cause this, and got appropriate answers.  The question was answered, so points should be rewarded. It isn't the fault of the experts that an engineer left your company. It doesn't change your question or the responses.
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Ben CampbellIT User, Manager, DiplomatAuthor Commented:
My apologies dlethe, but as the engineer has left and he solved the issue with telling anyone how he fixed it then it would be difficult for me to award points short of randomly selecting an answer.
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DavidPresidentCommented:
Then split evenly, because  all responses satisfied the question you asked, which was for "any ideas".  Remember, we took the time to answer your question in good faith and every expert who responded gave a different ideas ...which, again is what you asked for.
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Ben CampbellIT User, Manager, DiplomatAuthor Commented:
Ok I will do that, thanks dlethe and everyone for your time.
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