This is my first time building a PC and after assembling it, I turned it on and the CPU, GPU and one case fan turns on for about 10-15 seconds until they power off again for 3 seconds and then the cycle repeats.
These are the steps I've taken to troubleshoot:
-tried re plugging it in to power
-changing the outlet
-took it out to see if the PSU fan was running (it was)
I tried googling the issue but couldn't find any other problems matching mine.