In the event viewer I have multiple non stop entries for the time its set to a black screen after switching user (ive just been in another for over 50 minutes-I thought the system might finally correct itself-I was wrong). They all show "Source: System, Application popup:\SystemRoot\System32\win32k.sys failed to load" every few seconds. This is when the processor seems to be running fairly high, and evidence of this may be in two single events I have that differ to the above:- "Source: Microsoft-Windows-Kernel-Processor-Power Description: The speed of processor 0 is being limited by system firmware. The processor has been in this reduced performance state for 48 seconds since the last report."
Ive tried searching for a fix. This post suggests I should try changing firewall:- http://www.pctools.com/forum/showthread.php?55622-Black-screen-when-using-fast-user-switch-in-vista
Some other forums suggest its a hardware issue that might not be possible to fix in vista and 7, as that may be down to the manufacturer updating its graphics drivers and nothing more:- http://social.technet.microsoft.com/Forums/eu/w7itproui/thread/80b7b992-897d-4425-9ed8-29901404d529
I dont think Ill be using that automatic update for any graphics drivers anytime soon again (or switching user), but both the generic graphics drivers and manufacturers drivers have the blank screen effect whilst switching :( Ill try a change of firewall or switching off other system protection to try and work out if that could be the main cause. I doubt thats the problem. Sending the error report for each log gives no further info. Has anyone else had an issue in switching users in vista and 7? Not that im suggesting you try it, as you may then be forced to watch a blank screen for more than a few minutes with your processor at the max, before being forced to do an auto shutdown :(