Cable TV box input

[Raul69]

Hey guys I got a Alienware 17 w/ AMD Radeon R9 M290x graphics card

When I connect the Cable TV to my laptop to use it as a monitor I get the signal from box but it's moving all over the place and flashing, I tried the box in the second room and same results. I connected my ps4 and everything works fine.

What could be wrong? Any help would be great.
Btw I used same cable from tv box to plug ps4 so it is not the HDMI cable.

There is a new catalyst update which I haven't done, idk if it would matter.

 

[jbomb7124]

it has to be a resolution issue check your output from the box it may be putting out 1080p and if your screen is not able to except that then you will have to lower the output could be a frequency issue as well 60htz vs 120 will cause the same results

 

[Raul69]

it has to be a resolution issue check your output from the box it may be putting out 1080p and if your screen is not able to except that then you will have to lower the output could be a frequency issue as well 60htz vs 120 will cause the same results

Thanks ill check that and hopefully it fixes it.