I’ve just oredered another PSU (and another 4gb of ram cos an i7 + 1080 with only 8gb is a bit retarded lol) so we will see tomorrow if the PSU is the issue
Try clearing the CMOS (take out the watch battery on your mobo). Check all of your cables make sure they're plugged in (sounds like a rookie mistake but has happen to me plenty of times) try swapping components if you have any extra lying around.
The repair place called me, turns out the motherboard was completely fucked, what I get for trusting some shitty amazon brand, thankfully all of the components are safe