Black screen of death - windows Server 2008

Our domain controller is comi g with onlu a black screen with the mouse. We are unable to log in because the ctrl alt del does not appear just stays black. We have tried safe mode, safe mode with networking, last known good configuration, directory services recovery mode, debugging mode, etc... with no luck. This happened after applying a test gpo that applied admin right to a user to assist in upgrading an erp software.
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Mal OsborneAlpha GeekCommented:
Tried an RDP session from another machine?
maximus1974Author Commented:
Yes and nothing. Also tried vnc.
Mal OsborneAlpha GeekCommented:
Can you ping it?
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maximus1974Author Commented:
No. We used to be able to but it stopped.
Mal OsborneAlpha GeekCommented:
My guess here would be a hardware problem, possible hard drive.

Is this a single drive, or RAID?
maximus1974Author Commented:
Raid 5. Any way to repair with win 2k8 dvd?
Abhi PappiTechnical Lead - Network SupportCommented:

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maximus1974Author Commented:
Thanks. Doesn't it require to be logged into the Servet to run the vommands in the links provided?
Abhi PappiTechnical Lead - Network SupportCommented:
Nope. Boot with the OS image and run it in the "repair your computer" -> command prompt. Hope you haven't gone through them?
Scott SilvaNetwork AdministratorCommented:
You said you applied a GP... I hope the domain controller is in a different OU than the PC you applied the gp to?
maximus1974Author Commented:
Yes it was
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