After some fantastic support I recieved about a year ago, I would like some help with a new problem which has happenned tonight.
I've just connected a new internet cable to my computer. As I did, I knocked my HDMI cable out, which I use to display my screen (via my graphics card). I replaced the HDMI, and the resolution was fine. However, I then dusted my keyboard, and I noticed that my resolution (essentially fullscreen on my 1980*1024 TV monitor) has reduced to a "narrow" almost 4:3 resolution.
I've checked all monitor settings and nothing has changed. It is able to show full screen images with no problem (tested using built-in troubleshooting menu).
Windows resolution is showing 1920*1024 (which is a 16:9 ratio...), but physically my screen is 4:3 at the moment, so everything is squished and not corect. I don't know if I've pressed something on my keyboard by mistake, or if a piece of hardware has failed, or what. I'm completely stuck.
My monitor is a Samsung 23" TV. I use the HDMI input of this to display my computer. There are no other inputs.
This is connected to the PC via a medium-quality 2M HDMI which is connected to my graphics card (ATI Radeon 5700).
My PC is a homebuilt affair; Windows 7 home premium x 64, AMD Phenom II X6 1055T 2.8 GHz processor on a (currently I cant remember) motherboard.