HDMI port not being recognized (GeForce GTX 960) Windows 7

[Zeken3756]

Have been trying to connect my PC to my new LED TV for the past 5 hours via HDMI and still have no clue what to do
Tried
Updating all drivers
Display settings in Nvidia control panel
Screen resolution
Playback devices (HDMI not appearing)
Resetting PC a lot
Different HDMI cables
Different HDMI ports (on TV)

No clue what I'm doing all help is appreciated <3

[Mark.]

just to state the obvious, is there a setting on the TV as to where it gets its source from, like, AV1, AV2, HDMI1, HDMI2 - that sort of thing, and you have changed that setting to match the HDMI port you are using?

what's the age of the TV and PC?
what HDMI versions do they support; HDMI 1.2, or 1.3, or 1.4 etc?
same for the cable, some cables are built for certain HDMI versions.