Can' connect toshiba to panasonic TV

[kappashirama]

Hey
I have been browsing the forums for ages and tried everything but nothing seems to work to display my pc on TV.
Facts:
-Plugging toshiba through hdmi on a LG TV, instantly displays the image

-Plugging a compaq laptop (win.8) with hdmi to panasonic TV instantly displays the image

-Plugging toshiba to panasonic with hdmi: nothing happens (tried drivers, project image, change hdmi ports, change resolution,...)

All tests with the same hdmi cable

Help please im going mad

 

[smorizio]

if it a laptop you may have to use the fn key and one of the funtion keys to turn on the ext video port.

 

[kappashirama]

if it a laptop you may have to use the fn key and one of the funtion keys to turn on the ext video port.

Oh yeah forgot to mention that I also tried that