Check out Sam Goldwasser's RepairFAQ on monitors:
http://www.repairfaq.org/sam/monfaq.htm
And especially this section:
http://www.repairfaq.org/sam/monfaq.htm#monpsychc
But from my own experience, it is often very difficult to be certain what
is wrong with a monitor.
Best wishes,
Chris
 A while ago I got a temporary Hardware Problem with the old CRT on my
old
 but still useful machine. Using Unix Console the White font turned Cyan
 for that session. From what I remember it only happened once or twice
 under Unix, while under Windows the same CRT flickered briefly from White
 to Cyan several times, then back.
 Somebody in a User Group reported the same phenomenon, so it looks like a
 low-voltage problem during the Winter. It hasn't recurred for weeks now,
 so maybe my old CRT isn't going to crash & burn just yet. Does anybody
 know the explanation for this?
 Anyway that's why I was interested if anybody was giving away an unwanted
 CRT for free. Though it looks like there's no real urgency now.
 Frank Mitchell (mitchell(a)wyatt672earp.force9.co.uk)
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