BSOD: *** STOP: 0x0000007B (0xFFFFF880009A9928, 0xFFFFFFFFC0000034, 0x0, 0x0) System was running fine and yesterday upon booting I received a 0x7b blue screen. Bios appeared changed by something and I restored back to normal settings but still BSOD on each boot attempt. Windows starts to display the flags and then crashes. I have an SSD primary and a raid data volume. There is no minidump, nor can I get a ntbtlog.txt generated to show where the error might be. Safe mode fails, last known good configuration fails, system restore fails, disable driver signature fails, Chkdsk showed no errors on either set of drives but was run in fix mode to be sure. I was able to do a backup with Acronis and can use the repair command prompt to access the drives. Safemode crashes at Classpnp.sys. Tried replacing it was a good copy from other machine. No change so put original back. Startup repairs fails and then says: cannot repair this computer automatically Problem Event name: Startuprepairoffline problem signature 01: 0.0.0.0 problem signature 02: 6.1.7600.16385 problem signature 03: unknown problem signature 04: 21200653 problem signature 05: AutoFailover problem signature 06: 20 problem signature 07: BadDriver OS Version 6.1.7600.2.0.0.256.1 LocaleID: 1033 diagnosis and repair details reports Root Cause found: A recent driver installation or upgrade may be preventing the system from starting. repair action: System files integrity check and repair result: failed. error code = 0x490 If it is a driver issue, I can't figure a way to see which on it might be. Have tried setting BIOS to IDE from RAID. When using IDE mode an NTBTlog file is generated but not when in normal RAID mode. I added the minidump files although none are recent corresponding to the current BSOD. The system doesn't seem to write minidump or ntbtlog.txt files. Win 7 X64 ASUS P6X58D I7 Any thoughts would be appreciated.