Panasonic MX50A Troubleshooting

Hello everyone! I’m pretty new to all this, but I’ve researched quite a lot before diving into the rabbithole. I recently picked up a Panasonic WJ-MX50A on eBay that was in working condition (i.e. powers on, all buttons light up, no major issues, etc.), but when I attempt to connect any video source into any of the video inputs (either through BNC/COMP or S-Video) I don’t get any signal. I am able to output the video into a TV, but all I get is this:

I am able to modify the color output on the screen using the color corrector joystick, I can switch between matte outputs (black, white, etc.), I can use all the different swipes/fades and auto fades/swipes, I can switch through channels/inputs, I can modify the video output with digital effects (negative, mosaic, paint, etc.), and I am able to change the border and color of the matte generator.

But anything I plug in no matter what input or output selected (including self-feedback by plugging an output into an input) gives me absolutely no change from having nothing plugged in at all. Is this thing broken or am I just stupid?

Thank you all so much in advance.

i doubt this will work, but have you tried switching the reset switch on and off?

Oh yeah, I’ve tried it while the machine was on and while it was off to no avail. There’s really nothing I can do to get this thing to work.