Black screen of death on SBS 2011

My client has a Windows SBS 2011 server. Last night exchange service pack 3 was installed but it crashed half way through. I ran it again today and it nearly finished and the crashed again. The system was worked apart from messages were queuing. The were default website error also to do with OWA. The server was rebooted however i forgot the HP network utility was open and running as it appeared to hang and it was in the middle of changing the adapter speed....doh! it appeared to hang the system. On restart the system now hangs at the point it changes from the black windows screen to the grey background. The monitor just turns off. Users could access the network shares but no email and no interface. I could also attach Admin tools from others server but "connect to another computer". It booted into safe mode a few times but now it does the same in safe mode. Just hand with a black screen and a mouse cursor.

I still think its the network card initially. I can only access the system via the repair console. How do i find the drivers for the HP ML350 G6 and remove them.
VBOSSAsked:
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VBOSSAuthor Commented:
The on board network card had a fixed IP that it did retain but now it appears to have been lost as i can no longer ping the system or access it from other servers.
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VBOSSAuthor Commented:
Due to the time constraints i am happy to say this one i have managed to resolve myself. I simply booted into into the repair console on the original HP SBS disk and went to c:\windows\system32\config and made a new folder RegOld. i moved the old registry files Default, Sam, Security, System, Software to the RegOld folder. Then went into the c:\windows\system32\config\RegBack folder, checked the files dates which were only a few days older and then copied the same five files in this folder to the c:\windows\system32\config. Rebooted the system and it worked a treat.
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