Howdy Macintosh Garden!

Sorry if there's already a thread that offers the remedy, but after a few searches I couldn't find it :/

I've been looking over the fantastic guides over how to capture the ROM and run emulation via Basilisk II, so I dug out my old Performa 550; it'sa bit dusty, but it's in OK shape, or rather it appeared to be.

When I turned the PC on, it works like a charm except for one terrible little problem. The computer seems to have a problem with vertical 'skipping;' and the monitor almost looks like an old film reel that's moving to slow. I tried fiddling with the vertical hold controls on the back of the case, but alas, no go.

I could still possibly grab the ROM off of it, once I get a USB Floppy to get all the correct programs from my PC to it, but I could also develop epilepsy from looking at it! Any potential thoughts on how I could repair it, or if I should just search for another one?

Thanks in advance!