Macintosh Classic distorted startup screen

Hi! I was not sure what category to put this question in, so please excuse me if it is in the wrong place.

Earlier today I tried to boot up my Macintosh Classic to check if it is was still running smoothly after being stored for a couple of years.

Unfortunately, something has happened - and I am not sure what.

When I turn it on, I hear the hard drive spinning up and the screen is coming to life. But it is only showing a distorted "Screen of death". It was running great 2-3 years ago.

It has been stored in a basement with a small amount of humid. I never thought that would be a problem, though, since I both store and run other computers there without any problems.

Does anyone know what this problem could be caused by?

I'm very grateful for any answers

Daniel

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Here is a picture of the distorted screen

Good morning, and thank your for answering quickly

Intell: Yes, I think so. It is what I feared I do not know too much about electronics, but are these replaceable in an easy manner, with little or no soldering? Or am I better off looking for a complete motherboard?

MacTech: I'll try that out right now and come back with details later.


Again, thank you very much for your answers

Update:

Leaving it on for 20 minutes, turning it off and then on again, worked brilliantly!

That was very unfortunate. I will look into changing them when they eventually fail. Thank you for such a detailed post. I highly appreciate it