Monitor on my Mac Plus works for a few minutes and then goes black

[rabid cabbage]

Hello, my Mac Plus was working perfectly fine until I opened and dissembled it. After that the computer will boot up fine but after a few minutes the screen goes black. Any ideas what I might have screwed up? Shortly before that I also saw some weird artifacts when booting up from a screen, black and white vertical stripes (pretty thick ones, about 1/10th of the monitor in width).

 

[MOS8_030]

Try re-seating the ram chips.

 

[rabid cabbage]

It doesn't look the machine crashes (which is what I'd expect from RAM problems). The screen just goes dark, as if you turned it off. I'm afraid I screwed up some cable or bumped into some component on the video board when I opened the machine. I'm not sure how to debug this.

 

[rabid cabbage]

Actually, I take that back. The weird stripes that were showing up initially did seems like some sort of glitch that might come from RAM problems.

 

[dochilli]

Resoler the pins of the cable between the logic board and the analog board. Pin 1 on the analog board is often broken.