[SOLVED] Gpu no signal mystery!

Dec 25, 2020
1
0
10
A couple days ago i built a pc for my brother on my test bench

Msi b450 pro carbon
Ryzen 3700x
Msi 1660 ti
Rosewill photon 1200w (extra one i have)
G.skill trident z 16gb 3600mhz

Everything went amazing did well in benchmarks and stresstests no issues what so ever. I then transferred the system from the bench to the case, then i start having no signal issues. I tryed 2 monitors both hdmi and display port in both pcie slots still nothing.
Then i proceed to swap the gpu to a asus1050 with all the same variations, but still no signal. I then try my gpu because i know that one works evga 1080ti ftw3, but still no signal.
Heres the fun part i took my (working gpu) and put it back in my pc and it no longer works! I also tryed the 1660ti and the 1050 and they dont work either! HELP

Keep in mind after all these failed attempts i sawped the psu to my evga 1000w and repeated all the tests with the same result. No signal =(