Intel Q35 internal display chip on my Dell PC a long time. I found that if I removed the igfxpers.exe which seem to do automatic-checking for new displays that are connected.
When igfxpers.exe was running on Vista, I could disconnect a monitor and then reconnect it and it did not find the signal. But if igfxpers.exe was not running, I could remove a monitor and then reconnect it and it worked fine.
However, in Windows 7, this behavior is not the same. Whatever I do, I cannot reconnect a monitor. I always have to reboot the computer to make it detect the signal.
Do anybody have any clue for fixing this? Or do I have to reinstall Vista?
I don't really see a forum devoted to this kind of issue, so I am suggesting that you go here: http://www.intel.com/p/en_US/support/?wapkw=supportand locate your product. You should be able to find more information that way, and if not, then "Contact Support" here http://www.intel.com/support/feedback.htmwill allow you to communicate with someone who can help you.