CRT screen Twitches then Spazzes out before Shutting the system down

Do I have a power supply issue?
The CRT twitches a bit early on -- warning signs. Then it gets all "fuzzy" -- goes black & white with some fine horizontal lines, shrinks to about 2/3 size and suddenly Shuts Down the system.
Sometimes you can restart immediately but more often than not this just lead to another immediate Shut Down. After it's cooled off or something it starts back up, no problem.
Best guesses? Thanks in advance.

This old iMac rocks on newly signed up DSL...wish I could keep it longer but the electrical problem is disheartening!

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CRT screen Twitches then Spazzes out before Shutting the system down

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