so annoyed rn my second-hand Switch used to work fine docked. Now on my new 4K TV:

No Signal
HDMI 2
Check the cable connection and the input source.
The dock light turns on, teh console charges, but no pictrue. Im using the dock from a friend lol Ive unplugged everything once and plugged it back in. Is there a reset for the dock, or did something break??
Anything i can test without buying stuff would be great. i have a spare HDMI cable smoewhere, i think, and maybe another TV in teh house. im about to throw this thing out the window lol