On Mon, 11 Mar 2002 at 10:53:48, wrote:
(ref: <H0000b5f122619c6.1015844026.ln4p1327.ldn.swissbank.com@MHS>)
>It was not a good weekend for my Q40. The problem is with the video.
>The machine boots and appears to be working because you can still see
>the picture on the monitor, but superimposed on it are shimmering
>horizontal lines that wander up and down the screen. Sometimes, if I
>switch off, wait a minute or two, then switch back on the picture will
>be stable but this is shortlived - the 'interference' soon comes back
>again.
>
>I've done as many basic checks as I can (I'm suspecting the problem is
>caused by dirty/damaged contacts somewhere) - the monitor works OK on a
>PC, the header plug connecting to the video pins on the mainboard is
>not loose (though not particularly tight either) and none of the pins
>are bent. I checked the seating of the I/O card, the contacts on the
>card are clean. Looking into the slots, all the contacts appear
>correctly aligned. I suppose there is the possibility of tiny breaks
>in any of the tracks on the board,
Very unlikely indeed.
>but the only stress the board has
>had was when the I/O card was originally plugged in, and the machine
>has been working fine for a long time.
>
You don't actually say, but are your memory chips soldered or socketed?
If socketed, then check that all pins are properly located.
You also don't mention system ram - always worth cleaning the contacts
on the simm(s), and making sure that the socket is physically OK.
--
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