PC switching off display

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When i have my computer on it sometimes just loses connection with the tv.

I have a pc connected to hdtv using hdmi and a graphics card. When it is on it sometimes just comes up on the tv "no signal" which is what you get when you change to a input that is not connected to anything. The computer usually stays on(i think cause all lights are still on) and some times it restarts itself.

Initial reaction was i have a faulty graphics card and it is cutting out for whatever reason. Last night i got round to taking ti out and connecting through rgb cable and guess what it does the exact same thing.

So looking for ideas.

My next step would be to check the ram which i may do this weekend but has someone came across this before and found out it was something else.

Just like to see how other people also would of diagnosed this.

Cheers guys

 

This can happen while doing something on the screen, so i dont think it has anthing to do with power saving.

The only way of getting anything back up on the screen is by doing a reboot.

 

^^ kindof this.. as it's sometimes displaying and then disappearing, i'd check refresh rates and drivers as well as changing to the tv's native res (if you havent already).
It looks as though the tv cannot handle the input.. need to find out the reason for the change