Computer CRT monitors turning monochrome, or one-color

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This has happened to me two times: one a few years ago, and one yesterday. Yesterday my brand-new Princeton Graphics System CRT monitor from a thrift store that sells computer parts that I got for $5 dollars on 12/22/2007 suddenly turned monochrome just like another monitor that's now in the shed. I tried jiggling the VGA cord that connected the monitor to my laptop that's falling apart even now and it rapidly switches to different colors. I tried to use boxes to hold the cord up to get the monitor back to color, but they didn't last very long. The other one is in the shed, and it was a part of a Packard Bell PC that now went defunct and had to be discarded, but not before saving my stored files with the help of Geek Squad. This monitor turned as green as the Incredible Hulk, and no matter what I did, it either fizzed out or blanked out. I used this one since my laptop's natural screen whitened out some time after my bookbag's strap tore apart, fell to the bus floor and tearing up my used laptop. That's when I decided to turn my laptop into a mini-desktop. Seems like I got the opposite of the Midas Touch for computers, as they all turned to disaster. Did anyone else have the same thing for their desktop, and how did you resolve this problem? Recycled your old monitor and got a new one like an LCD, or got another CRT monitor?