Black screen on startup, no beeps

I changed PSU on my PC today while I was cleaning my pc from dust and now when I turn it on the monitor goes into sleep mode and nothing happens, no beeps, no image. All of the vents are working the new PSU is working. I tried to put the old PSU and it doesn't work with it either, tried cleaning the ram slots and nothing happened, tried to restart bios and nothing happened.
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More about black screen startup beeps
  1. I suggest removing all components/cables but CPU and CPU fan, reinstall them and test.
  2. I solved the problem, took out ram and then put it back it and now it works fine, thx anyways
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