The fact your displays are "trying" to load something is a hopeful sign, but I agree you have your work cut out for you. If you want to shoot for a quick motivating minor victory, sure, it normally does not hurt to carefully reseat all the connectors, including removing the driver board and reseating it. HOWEVER, those connectors have limited cycle times and known failure points, and if the game "comes to life" after doing that, there is NO guarantee it will stay alive. In fact, you can be assured it is merely an indicator some serious work will be required, like what slochar mentioned above. It's a rite of passage with old System 6 games.

The good news is if you are reasonably skilled and willing to take the time to learn and invest in a few tools, System 6 is a great platform to learn with in that it's a bit more forgiving when it comes to removing components and building your skills (unlike Sys11 and later, which you shouldn't even think about if you've never done it before). But you will need to take your time and do research.

Get a power supply rebuild kit for $10-20 and practice on that. Sure beats spending $80+ on a new supply, and they're actually pretty easy. After that, you can consider what lies ahead.

If you're not able to do tackle board work, you can find reputable techs here, or an aftermarket combo board such as the Rottendog 327. An aftermarket board is about $300 or so. Depending on the depth of work required, a paid tech rebuild could approach that... or maybe only a few bucks. Hard to say up front.

Blackout has a great layout and interesting sounds so it's worth the effort...