You have been using your computer with your TV for 6 months with no problems; Recently, the picture has “gone grey” with some initial flickering; The TV picture (as a TV) is OK; The computer, when used with an LCD monitor is OK.
I assume that the cable you use for the TV is different from the cable you use for the LCD monitor?
Putting this info together I would suspect the cable/plugs to the TV, or the sockets on the computer/TV.
Cables can break internally, and they can become disconnected from their plugs. You could try to gently bend the cable at both ends (i.e. near the plugs) whilst watching the picture. If you are lucky, you might briefly see the colour come back. If you do its 99.9% certain it’s the cable.
Gently “wiggling” the plugs in their sockets may also do the trick, but in this case it would tend to suggest the plug or socket.
Or simply trying a new cable would be easiest (if you don’t mind the possibility of wasting the cash!).
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