xbox one not turning on after replacing heat sink and fan

this was my first time cleaning my xb1 out since it was very dusty. I took it apart, cleaned it with isopropyl alcohol and put it back together. afterwards when I turned it on, it said there was a ventilation issue so I opened it up again and saw no visible reason as to why I got the error. so I waited a few hours with it unplugged to see it maybe if it needed to rest or something, but it still gave me the same message. I bought a new heat sink and fan thinking maybe it just needed to be replaced, but now it's not turning on. I have two power supply cords and I tried switching both, neither worked. I also tried resetting the power supply like recommended and it still doesn't work. does anyone know how to help fix this?

:)