Screen have no signal after I type in my password please help!

I was doing some cleaning in my desktop then I saw my graphic card's heat sink out of curious I dismantle the heat sink and the graphic card.. And realize my thermal paste is damaged and I quickly put them back then I assemble my pc back.. But when I on the computer and after I type my password ,the screen took awhile and then screen will turn black and say no signal.. After touching my graphic card the heat is super high then do I fix it?
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More about screen signal type password help
  1. get new thermal paste and apply it to the graphic card.
  2. Will that fix all the problem? Or it's just a guess that it will solve the problem?
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