HMDI output once recognized, now not showing up as detecte

Hi! Please help. Here is my issue in bullet points:


-Running my PC with a Radeon HD 7700 on Windows 8, main display is monitor in DVI port, secondary display is HDMI running to my LG TV for playing videos (only enabled some of the time in AMD Catalyst Control Center under "Desktop Management>Creating and Arranging Desktops")


-Normally, I enable the 2nd desktop (my TV) through the HDMI output of my video card easily. However, about a week ago I ran into an issue: while the OS detected the display, it only recognized it as a monitor in 640x480 resolution.


-I tried several things to fix the display issue, but was finally successful by changing the HDMI cable connected to the TV side to the second HDMI port on the back of the TV (that is, going from HDMI 1 to HDMI 2). This fixed the issue immediately.


-Good till yesterday. Now the HDMI 2 is no longer detected as a valid display. HDMI 1 (the original connected port) is still detectable, but it's still having the 640x480 max resolution issue (and no audio output as well).


-HDMI 3 on the TV currently works, but that is the final HDMI port on the TV, and I don't want to continue moving the cable without resolving the issue. I have tested the TV HDMI 1 and HDMI 2 ports with other hardware, and they seem to be working without fault with a DVD player or Media box, so I doubt the issue is surrounding my TV.

Please help me make sense of this! I'm really worried that I won't be able to use my desktop on my TV any more and I can't for the life of me understand why.

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