I have plugged in a HDMI into my graphics card for my main TV which is working find but then I plugged in a DVI to HDMI into my graphics card and when I booted PC it worked fine but now PC knows it's there but TV is saying no signal.
Post your full system specs please - - we can't get anywhere without those. You should never start a thread without including specs, no matter how irrelevant to your issue you might think they are..