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Keyboard failing when projector is turned on

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We have a Dell laptop (out of warranty hence posting here) which is connected to a Smart board, projector and with Windows 7 installed.

It has a really strange oddity in that if you turn the projector on then turn the laptop on when you get to the login screen you can't press Ctrl+Alt+Delete to login. The only thing you can do is to shutdown the laptop (powerbutton jobby), turn off the projector, turn the laptop on without the projector and then login, turning the projector on afterwards.

I have tried video drivers (using nvidia rather than Dells) but still can't figure out why this would even happen, let alone what to do to fix it.

Anyone else have any ideas or seen this before?


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