I bought some sleeved cable extensions for my psu to make my build look a little nicer. I put them in and brought my tower back to my room and plugged everything back in but it wouldn't boot up. I assumed I fried something and sent it in to my local computer repair shop. They fiddled with my cables and it turned on perfectly for them and I had it back home within an hour. Again I plugged everything back and again, no power. I called them next day since they had already closed and told them it wasn't turning on again. They asked me to come back in and I did. I watched them this time and when they plugged everything in, it booted up with no issue at all. I brought it back home and still nothing. I've tried a different psu and a battery backup and I'm still stumped. There is a led light that turns on, on my gpu when I flip the switch on the back of my psu but that's all I see that actually shows power.