What to do if the DisplayPorts on the video card stop working?

Question

Video cards

I have a 2080ti on board with 1 hdmi, 1 type-c and 3 displayport. Everything worked perfectly via DisplayPort until the appearance of a second monitor a year ago, which I connected via hdmi, after which, for no particular reason, I lost signals from both monitors. Then I changed hdmi - it worked, but DisplayPort did not start working. None of the three. During this year, I tried: changing drivers to fresh/old ones, flashing the video itself, flashing the monitor, tried other cables, tried adapters, I even managed to change the mother + processor and, of course, demolished Windows. In any case, none of them worked. I tried to put another video card - the signal goes from it via DisplayPort, everything is cool, cool. Not with mine. As a result, I bought an adapter from type-c to DP and now the main monitor works through this adapter. The funny thing is that during this year I periodically connected the monitor back to the native DPs on the video card and they worked for a day\days\week\weeks, but after that they still stopped working for ~ a month, after which I reconnect the monitor to them, they are the same work for a while and then stop. Now I plan to buy another screen, but it turns out the emphasis is on these ports and their performance. Actually, what else can I try? I understand that the problem, apparently, is at the hardware level, but, nevertheless, maybe there are some options? Actually, what else can I try? I understand that the problem, apparently, is at the hardware level, but, nevertheless, maybe there are some options? Actually, what else can I try? I understand that the problem, apparently, is at the hardware level, but, nevertheless, maybe there are some options?