POST Issues After Multiple GPU Changes

[Tynan Vilmos]

System was running fine with 1070 for a couple of years
Swapped from 1070 to 2080 super to test possible bottleneck and a fan issue on 2080, System continued running fine.
Swapped back to 1070, system powers up, no POST.
Swapped to 2080 OC [which had been used in the past and worked] Power up, no POST.
Swapped back to 2080 super, Power up, no POST.
Tore whole system down to re-seat and re-connect all cables, re-built with 1070. Power up, no POST.

In every instance where the system does not POST, the power button on the case also does nothing even when held.

Edit: sorry if some of the specs below are a bit vague. I don't recall the exact details and with the system not booting, it makes it a bit difficult to retrieve them from the system itself.

• ASUS ROG X470-I Strix
• AMD Ryzen 5 1600x
• 2x16 Teamgroup DDR4
• NVIDIA 1070 Founders, ZOTAC 1070 Super, GIGABYTE 2080 OC
• Samsung 870 EVO 1TB boot drive
• SEAGATE Ironwolf 10TB HDD
• EVGA 550 GM