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I have my laptop wired up to the tele.
Fn+f4 should let me see settings for laptop/tele.but it does not respond.tried everything I know ie:cleaning blowing on it,can you hellp
Rab

I have cleaned it the fn key works with brightness and sound no problems

Noo I have not tried another key board

I was trying combination.FN+F4,laptop to tele.sorry

Sorry I should have said it's a .advent ert 2250 laptop.

Hi all
My keyboard tab ,f4 is not working can anyone help please
Rab