Question PC having trouble is it my recertified power supply?

Feb 4, 2019
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Build is as follows
GTX 1080
I7 7700
Biostar Racing Z270GT6 motherboard
16gb ddr4 ram
corsair 750 watt bronze recertified power supply

I upgraded a couple months ago and cheaped out on a recertified power supply, well the other day im gaming in the morning turn off my pc normally through windows, come back in a few hours too boot up and computer starts but will not display too either of my monitors(Most LEDs on, all fans on all components spinning) so i unplug everything (power cord, hdmi, all cables on the outside) and do a good dedusting still nothing. few days pass and on a whim i press power and it boots up normally i play for a few hours, turn it off & when i attempt to get back on its back to no display. i hear no beeps on start up. The 2 main reasons im thinking it is power supply is 1.its the only refurbished component in the build & 2. some of the leds are not powered anymore and on the day it worked the LEDs did as well. im not very intelligent when it comes to computers and i dont know if anyone could tell me based on this info so thanks for any help
 

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