Question Pc won't turn on after a week

Dec 16, 2020
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Problem

So i built my pc over a week ago and it had been working perfectly fine the whole week no problems. Then about 3 days ago i was browsing on Google not even gaming and the pc shut down. Ever since then when i tried to power on, the fan lights turned on for a split second then turned off. Along with the fan lights the cpu light on mobo turned on and off also. I checked all the connections and tried to isolate cables and components but nothing worked. I also reset cmos but same results. Some people told me to rma the psu which i did. I sent it in for a replacement and now I’m waiting till they send a new one from newegg. I’m not sure if its even the psu so thats why im wondering if anyone has had a similar problem or have any idea on what the problem is. This is my first build and i rlly wanna be able to use it soon so any input helps.