That's a new one.

IF it happened exactly as you say, and it's not a problem with your cords or hookup method (test with other cords, direct to your TV with the switcher out of the way), then it could be your video encoder is fried.

That may or may not be worth repairing. IC level replacement is always tricky and time consuming, and not awlays successful (but still time consuming).

Note to self- avoid switchers than can do this Yikes!