Need help diagnosing older CRT monitor color issues

I have a video slot machine which includes a Ceronix 17" CRT monitor. I am having color issues and would like some help diagnosing what may be wrong. Below are 2 photos, showing what my graphics used to look like, and what I'm seeing now. The vivid reds and yellows are gone and everything has a green/purple tone. Any ideas on what could be wrong?

It used to look like this:

Here is what I'm seeing:

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More about diagnosing older crt monitor color issues
  1. Best answer
    could be a poor connection, try checking the vga cable or even replacing it. also check that the gpu for the system is not overheating as this can cause strange colour issues.
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