My tv wont pick up the computer signal

to whom it may concern,
recently i purchased a new comp. and after upgrading the hard drive and the graphics card i began to have issues with my hd picking up the computer signal.i can sometimes get it to work and other times i can't.
thank you,
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More about wont pick computer signal
  1. Your cable connecting the PC to the HDTV might be faulty. Have you tried a replacement?
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