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Here's my situation: when switching from one user to another, the monitor goes black, then large letters come on that say PC Self Diagnosis Y or N? It then goes completely black causing us to reboot. Also, the light on the monitor blinks on and off. It does not seem to be a hardware problem. Can anyone offer any advice?
Does it try to sell you a program to correct the problem? (open your browser and take you to a webpage)
If so, it is malware, and you should install, update and run Adaware, Spybot Search and Destroy and the Microsoft Anti-malware beta to try to get rid of malware infestations that may be present in your computer.
I apologize, I should have been more clear. You cannot click on anything. There is no cursor and if you use the keyboard to hit yes or no, nothing happens. It quite literally goes from asking you that question to a completely black screen in a mere moment. The only option is to reboot.
I don't know if this is helpful to anyone, but we recently reinstalled Windows XP. I also did have fast user switching enabled, but took that off...which did not help. I'm just trying to add as much info as possible....