Why is my internal A monitor be cut off by my external screen?

I have 2 external monitors for my Cobalt10. When I powered up today my A internal monitor didn’t come on.  I went to the monitor settings, hit identify and my second external was saying it was A. I tried to reconfigure but it wouldn’t save the settings. If I disconnect the monitor the internal comes back on. My first external is showing up as 1 no matter where it’s patched in in the back of the console. If I plug the second in anywhere on the console it cuts off the A internal and takes its place.

Neither of the externals are touchscreen.   They have worked perfectly since I got the console last spring. It was perfect yesterday.

I switched cables and monitors and adapters.

Any ideas?

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