joshia@buster.cps.msu.edu (Amaresh R. Joshi) (06/26/91)
Hi folks,
I'm having the following problem: the mouse
leaves a trail of dots on the screen in windows.
Specific Symptoms:
- it only happens in VGA, switching to EGA gets
rid of the problem
- it happens in all three windows modes /s, /r, /386
- it only happens to certain colors, the light gray
used as the default windows background is particularly
bad
- the dots are about half an inch behind the cursor point
- the dots aren't randomly scattered but fall only on
vertical lines spaced about one quarter inch apart
- sometimes when I unhide a window part of the screen
is covered with these lines
-refreshing a window gets rid of the dots, till they
start coming back
- I get the same problem with
MS Bus mouse
CompuAdd's serial mouse (a really lousy mouse!)
Logitech Trackman
-rest of the hardware:
CompuAdd 25mhz 386
CompuAdd 16bit VGA card (type A)
Nec 2a monitor
I've tried:
- stripping the autoexec.bat and config.sys to the bare
minimum
- getting the latest drivers from CompuAdd's BBS
-trying the three different mice.
Nothing seems to work. We have other CompuAdd machines here
with the same setup except for the monitor and card. So I figure
the problem is with the card or the driver. Any help will be
appreciated.
Amaresh Joshi
--
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joshia@convex.cl.msu.edu | '... accross the pale parabola of joy'
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------------------------------------------------------------------------billf@hpfcso.FC.HP.COM (Bill Flynn) (06/27/91)
Amaresh, This is incredible! You have exactly described a problem that I experienced a while back after installing an STB Powergraph ERGO-VGA card. I finally came to the conclusion that it must be a hardware problem, most likely with the video card. I decided to reseat all socketed IC chips on the VGA card. When I pulled out one of the DRAMs I found three of its pins skewed outward. Not out of the socket, just outward. I straightened them out and haven't seen the problem since. After reading your message I'm not so sure this was the cause of my problem. Your VGA card may use the same chip set as mine and perhaps it's a problem with that chipset. Try reseating the ICs and see what happens. Bill...
jcwasik@PacBell.COM (Joe Wasik) (06/27/91)
In article <1991Jun26.030203.18325@msuinfo.cl.msu.edu> joshia@buster.cps.msu.edu (Amaresh R. Joshi) writes: > I'm having the following problem: the mouse >leaves a trail of dots on the screen in windows. You almost certainly have a bad graphics card. Borrow someone else's VGA card. Chances are your problems will go away. -- Joe Wasik, Pac*Bell, 2600 Camino Ramon, Rm 4E750V, San Ramon, CA (415)823-2422 email: jcwasik@clib.PacBell.COM or [...]!pacbell!clib!jcwasik M06UE<FEC86YS('-U<W!E8W0@;F]T:&EN9RX@(%!R;V-E960@=VET:"!P;&%N ,<RX*+2T@0F]R:7,*
billf@hpfcso.FC.HP.COM (Bill Flynn) (06/28/91)
Amaresh, I was talking to my Video card vendor (STB) yesterday looking for a new Windows driver. I mentioned my previous problems with mouse droppings and that you had the same problem on a different brand of VGA card. I told them what I did to get rid of the problem and they were quite surprised that worked. They said (as Joe correctly stated) that it's a hardware problem, most likely a bad DAC (digital to analog converter). Joe's right, get a new card. Bill...