I had similar symptoms with a CTX monitor, but it would black out and come
back on by itself after a few seconds.  After a couple of days of this, it
went off and refused to come back on.  I took it to a repair shop and they
told me that there is a common problem with many CTX monitors which cause
this.  Unfortunately, I do not recall what exactly the problem was, but it
was not the switch or the power supply.  I believe it was due to a solder
joint breaking down and eventually causing some components to fail.  It
cost me $80 to repair it and it is still working fine after 18 months.

At 05:45 AM 4/30/98 -0700, you wrote:
>I have a Packard Bell SVGA monitor.  A few night ago while I was online
>the monitor went black and the power light on the monitor went out.  I
>turned the switch off then back on and the monitor was ok...... for
>about 15 minutes, then repeated the failure.  I repeated the fix, which
>worked for a few minutes, then it went out again.  now, it won't come on
>at all.
>