On Feb 5, 4:22*pm, Rich newtech
wrote:
There is nothing like that in my dm. When i expand the mouse it only shows
ps/2 mouse port. That's all.

I can think of a few problems that could cause your failure. An
example. If the power line for that mouse is disconnected (ie fuse or
automatic resetting circuit breaker open), then the mouse is powered
via signal lines. That would cause corrupted serial data - would
explain the symptoms I read. An LED and a 200 ohm resistor
temporarily touching the two pins would even test for that.

Your problem is why more responsible computer manufacturers provide
comprehensive hardware diagnostics for free. Many who buy computers
on price do not get those (what you need to solve the problem)
diagnostics.

Numerious other useful facts might be provided if you could provide
then necessary measurements or access. Some facts may have already
been provided. But too much information is scattered among other
posts that recommend nonsense - such as a defective BIOS. If s BIOS
is corrupted, then BIOS completely crashes the computer. Anyone with
basic programming knowledge would have known that.

If I was doing this (without diagnostics), I might write a short
program to read data direct from the mouse - to actually see what the
mouse is outtputing. Or measure voltage on the appropriate wire with
a meter. But that assumes I had to fix it. Apparently the loss is
acceptable.