I purchased a new card for my gaming rig a couple of months ago and removed my 1080. Yesterday I finally got some spare time and changed the existing card (970) out of this PC and replaced it with the 1080.  I have two Display Port monitors connected but only one will display at a time. It does not matter which monitor is attached both will work but only one at a time (changing the monitors by unplugging the cable at the 1080). I have attached 2 images to show what Device Manager shows. I have tried the latest drivers as well as older ones but nothing seems to be working. I have a 750W PSU in the PC.
Just in case the images have issues the message I get from Device Manager is:
Windows has stopped this device because it has reported problems. (Code 43)
 
I have done a fair bit of Google but none of the solutions I have tried so far (there are SO many out there) have worked.
Any ideas greatly appreciated.

Thanks for your reply Sajin
Okay, a small update. I had reverted to 442.74 but that did not work. Today I have reverted to the Original 1080 driver 368.25 and SUCCESS! The only problem being the Left monitor is notably darker than the Right. So now I will gradually work my way up through the Driver Revisions to see where I get to.
 
I still wouldn't mind any advice if anyone has any further/better ideas.
 
Cheers
 
Hazza

I am on 21H1 Build 19043.1052. I think this is the latest. However, if I install anything other than the Original driver (368.25) my problem returns. As I understand things this should not be the case but I have now installed 6 different driver sets and have had to Rollback each one. I have to admit I'm a little confused and somewhat stumped. I really appreciate your suggestions/comments. Do you have anything else you can think of?

Unfortunately No! Standard vanilla card. No OC even.
 
It is not the monitors as when I fire up another PC with those two monitors all is good. I'm so confused

No I bought it brand new (had for about 5 years now) and a pretty penny it cost me too!
 
It was in my Gaming machine until I bought a new card a couple of months ago

Sorry, what vBIOS? Do you have a link on how to do that?

just a final update. Firstly, thank you very much to Sajin for the suggestions/hints/etc. I had never even heard of the vbios switch before. I did try it but unfortunately it did not change my results.
 
I did, in the end, find the problem. It WAS the monitor BUT only the DisplayPort was affected (possibly a bent/damaged "pin" or dry solder?). The DVI and VGA ports were fine and I am using those two. I still have to use the old original driver but it doesn't affect anything that i know of so still happy.
 
Cheers
Hazza

Yeah - I agree. But I will leave it be at he moment as I have spent almost 3 days mucking around with changing these cards around and then trying to get the screens to work properly. I might attempt it all again another day  - just not right now