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New motherboard doesn't work with specific GPU, but works with others

Wow, this all sounds very familiar! I just bought a new motherboard and processor (MSI Z390-A Pro with an i5-9500) and wanted to put my old MSI GTX 760 video card in it...and it will not even POST. It powers up for a few seconds, then powers down, powers back up, powers down. Bought a new power supply...same thing. Tried a different power supply...same thing. Put the 760 back in my older computer and it works great. Tried a newer 1660 card in the new MSI motherboard - and it works great! But the combination of the older 760 in the new motherboard will not work! Tried both slots - same in both. I have no idea what to try but it's starting to sound like some of the combinations of new MB/old GPUs are a problem.
Nvidia 7*0 cards need the BIOS set to PCI-E 2.0 on ryzen, maybe some new intel boards are the same?
 
I was worried about this, with my MSI B450 Tomahawk Max and GTX 970 , but it worked fine with no issues at all.
 
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