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Projector and TV receives VGA-signal but doesn't realize it
Hey
I'm having the above mentioned problem with my father’s laptop.
He's a teacher so we bought the laptop so he could show powerpoint-presentations on projector, but the laptop doesn't work with all projectors. :-(
The output is received by the external screen/projector but the projector doesn't realize that there is input. In the classroom that my father teaches this spring the projector will for like 5 or 10 seconds show the pc-screen and then turn off.
We have a Sony-TV with VGA-plug so I tried connecting the laptop to our TV (different cable and different “external screen”). When I connect the cables, the TV doesn't automatically realize that there is a computer-input. But if I force the TV to show the "VGA-channel" the computer screen is shown perfectly on the TV. I believe the problem is similar on the projector, i.e. the screenpicture is sent trough the cable, but there's no "information" that there is a picture.
To test if the computer receives information on the cable I tried the setting that the screen should only be seen on the external screen. As soon as I plug in the cable to the PC the screen goes blank, so the PC recognizes the cable.
From PB's support homepage I tried installing/reinstalling the video-driver but unfortunately it didn't help.
(VGA AMD VGA Driver (Radeon HD 6650M) 8.783.2 130.3 MB 2011/01/20)
Have any of you any idea on how to solve the problem or at least where the problem is. Is it a win7 problem, a problem with the hardware (the VGA-plug on the laptop) or is it a driver problem?
And by the way: The computer is up to date with win7 updates.
Thank you very much in advance!
Thomas