Yellowish screen
On a CRT, "yellow" is a mixture of all 3 "primary" colours.
So, if you are expecting some other colour, then one of the 3 "guns" that are emitting one of the primary colours is NOT working correctly.
For less than $100, you can purchase a new, 19-inch (not 17-inch) LCD (not CRT) monitor.
This is less expensive than taking the CRT to a TV/video store for trouble-shooting and repair.
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