Question Need Help! PC turning on but no Display

[Macksvell]

Essentially got a 3090 a day ago and plugged it in my computer worked great. Then I decided it’s not worth it and wanted to sell it. I swapped it back out for my 1080 that was in the system before. Now I’m not getting any signal in either monitor (one is dvi and one is display port) but all the rgb is still lighting up including the ram fans aio and the 1080. Also the power button will turn the computer on but not off anymore. Also what’s weird is that my keyboard and mouse aren’t lighting up or working when I plug it in but work if I plug them into a different computer and I tried a different set of keyboard and mouse that will keep there lights on even if the computer is turned off and there lights light up still so there is some power coming through to the USB ports but not enough for them to actually work. I’m assuming it’s my PSU but I don’t know what could of gone wrong.

I’ve taken out and put back in the 1080 twice and still the same issue.

System Build
GPU: MSI GTX 1080
which replaced the Asus Strix 3090
Processor: AMD Ryzen 3900x
Ram: 2x 16gb Corsair 3200mhz
AIO: Corsair h100i
PSU: Thermaltake Toughpower 850watt
Motherboard: Asus X570-E

 

[norcalsc]

my first question is do you get display now with the 3090 in it? can you test the 1080 in another PC?

 

[Macksvell]

my first question is do you get display now with the 3090 in it? can you test the 1080 in another PC?

Haven’t been able to test 3090 in it again but will do when I can. And no I can’t test in another PC sadly

 

[norcalsc]

check with the 3090 if possible as that may indicate an issue with the 1080. sadly electronics have a weird way of dying

 

[Macksvell]

check with the 3090 if possible as that may indicate an issue with the 1080. sadly electronics have a weird way of dying

Will do will update in a bit

 

[Macksvell]

Just replaced the 1080 with the 3090 same issue 3090 lights up and everything but still no display and USB ports not working