Linh:
        If the screen goes crazy for an instant along
with the blackout, it could be an internal arc of the
high voltage circuitry. This could be caused by a
collection of dust inside the monitor or the circuitry
just aging.

        Many monitors go blank when they do not
receive a signal from the computer.  If this is your
problem, it could be caused by a bad monitor cable
or a bad or loose connection.  It could also be caused
by an intermittent video board or cpu. 

        If you can borrow a monitor to try. This would
let you know if the problem is with your monitor.
Good luck, Wally

On Sun, 12 May 2002 02:16:35 +0700 "Tran Tuan Linh"
<[EMAIL PROTECTED]> writes:
> Hi everybody,
> When I work at the computer, the monitor screen sometimes suddenly 
> blackens
> for one or two seconds then returns by itself to normal. This 
> happens five
> or six times during a working session of two hours. The monitor, 
> made in
> Asia, is four years old. What could be the causes for this? What 
> should I
> do?
> I am running Win 95B, Pentium 200 Mhz, 82 MB RAM.
> Thank you very much in advance for your help.
> With best regards,
> Linh (first name, Vietnamese)

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