I'm using HP DL360p Gen8, I can not start my Windows Server 2008 R2 SP1 server. When Welcome screen should appear I only see black screen and mouse pointer. When I'm trying safe mode it hangs trying to load "classpnp.sys".
I'm using "mirror-raid" + extra "spare" hdd installed, so I wonder how is it possible that i'm having troubles with corrupted files? What should I do? Should I reinstall Windows or there are other options?
This isn't necessarily related to corrupted OS bits. It might also be another problem. Try updating the server's BIOS and testing the memory. If you have USB devices attached remove them and try again. Failing this, you'll probably have to reimage it.
If you happen to see constant disk activity while it is hung it might also be a bad RAID controller, backplane or cable, or a disk with a weird firmware bug, though for this particular issue that is less likely.