Computer display problems from hdmi

I have an HP Pavilion laptop. Recently I got a Samsung LED TV. I am using an hdmi cable to connect the two and watch computer content on the tv. It works fine but when I unplug my computer display is messed up. There are gaps on top and bottom and it doesnt look right. I am not smart enough to figure out what the problem is. Can anyone help? thanks

 

So, it is fine, when it is plugged in, but, when you unplug it doesn't look good on the monitor (tv screen) I assume that powering off and on, fixes the monitor issue? Or is it the laptop that has the problem?

 

Yes it is the laptop that has the problem, the tv is always fine. When I unplug the laptop from the tv the laptop display is messed up as i described.

 

anyone have any ideas on this? thanks

 

um, i figured it out. thanks.

 

What did you do to fix it?

 

for some reason the computer was not letting me adjust the screen resolution. the next morning i was able to. thanks