Unknown power/hardware problem

tried to install new processor but the power supply wasn't enough for the new processor and had to go back to the original processor. Now computer boots,, and now graphics cards dont work... HELP what do I do?
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More about unknown power hardware problem
  1. how much power supply do you have?? mostly graphics card required 450w Power Supply.
  2. That is what I have
  3. What are the old and the new processors? Also what motherboard you have?
    What do you mean "computer boots"? Worst case: fans are on, HDD can have small "working" noise at start but nothing after. HDD noise after around 30s is a good sign (it means windows is loading).
    No matter what PSU you have, if you could play moderate games with the old one, the new one should be able to boot.
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