Quick help and troubleshooting for people who are experiencing power loss during bootups.
1st. Be sure that you are using a correct unit of PSU to your cpu. Most of regular users use 500Watts PSU to their regular PSU but users with watercooling systems or high-end video card/graphics card uses a higher unit of power supply with higher watts capacity. Always ask experts before buying a PSU, tell them your system setup so that they can recommend the best PSU for you. Don't buy generic PSU's this are not reliable PSU's, well, I can say that it is reliable if you're still using old model cpu's, you know what I mean, Celeron.P4,p3,p1..so on.
2nd. If you are sure that you passed the first step, lets move on to this, a lot of users put the blame on their PSU once they encounter failure on bootups or their system shutdown while running. One tip on this, go and check the power cord that is connecting your powersupply to the AVR,UPS or whatever regulator you are using. Do this especially when you are using a generic cord, idk if there are branded cords around the market but try to replace your cord if you encounter this problem, this might solve it. 49% of users having problem like this solve it by using this method, don't just replace your PSU without even testing the smaller possible parts that can cause the problem.
here is a photo of the cord I was talking about
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3rd. If you have done all above and still have a problem on it, try to remember if you have experience a black out with your system running, This might have damaged the mobo and If you did encounter this try using other PSU first to be sure, and if it still fails on booting up you may have to replace it with a new one, also test your PSU if it works on other cpu mobo's...
Note: Just be careful not to burn them hihihi LOL ...Hope this help.