This can be caused by some components in the bias and drive circuits to the
CRT that have become thermo sensitive. As they warm up over time, they come
back to be close enough to spec. I have also seen a CRT cause this before it
starts to fail.

An experienced tech, should be able to determine the problem for you, and
give you an estimate. You may find that since the LCD screens are becoming
so reasonable in cost, this should be the reason to do an upgrade.

--

JANA
_____


"Volker Greulich" wrote in message
...
I have an Apple 20 Inch monitor, 6 years old.
When I start in the morning all the sceen is looking light bluish.
But after 2 hours it changes colors to normal.
What is the reason? Where to look?

Thanks

Volker Greulich