I've had the same type of problem with a CTX VL710 I used to use.  I thought
it might have something to do with the refresh or sync rate, but I noticed
that if i would squeeze the front bezel towards the back half of the case,
the noise would go away (but never permanantly).

I'm sorry to say I never solved the problem.  I've thought about sending it
in to CTX (it too is about 1 year old) - or at least sending them an e-mail
about it, but haven't worked up the motivation yet.

One other wierd thing I have noticed - both on the VL710 (17") and my new
CTX PL9 (19") is a random pop ever once in a while.  It is similar to a
degause, but without the "shake" afterwards.  It never seems to hurt the
monitor, and may be some type of standard quick-degause, but it seems
worries me when it happens.  I'd say I've only witnessed it 4-5 times in the
last year, and only once on the new monitor.

Jeff

> -----Original Message-----
>
> Hi. My 19" Hitachi monitor, which is 12 months old & has been on 24/7
> since new but generally on blank screensaver for 20 hrs/day has been
> intermittently emitting a high frequency (~15000 HZ ?) low decibel
> level sound over the past several weeks. The sound emits for perhaps
> 15 min every hour or so, & I find it quite irritating.
>
>

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