Top Half of VHS Video Very Dark

I have a Panasonic AG-1980 that has barely been used by me and has been sitting around unplugged for a couple years. The video is now very dark with a bit of shaking. How dark and how much of it is dark fluctuates, usually the top half of the screen is the darkest bit. It's not the brownish dark like with Macrovision, but almost black sometimes. It's the same on my TV and computer. When I fast forward, the video looks as it should. It will barely play at all if I turn off the TBC, only showing a brief image occasionally. It doesn't matter if it's a purchased tape or one I recorded myself. Also, every time the tape starts playing the screen is almost completely covered with static for about 30 seconds, even if I just did a fast forward, rewind, or pause.

Does anyone know what the reason for this might be? Do you think cleaning the machine might help? Thanks.