Thanks - I agree and have tried everything. Computer 4 years old and now
distortion on screen which goes when I run mouse over it but screen also
going black momentarily - any ideas more than welcome
mouse AND screen issues sounds like driver problems.
Try and be sure all your divers are current.
One good way is to download "Driver Genius", NOT Driver Magic, from
download.com
It's not free, but you get like 2 weeks to test it.
That should be all you need to be sure all your stuff is current.
Download all the drivers it recommends, then install one at a time,
watching your warnings so you don't write over a new driver already on
your system with an older one.
Also watch warnings that your current driver is correct.
All those downloaded drivers will make a nice CD (or flash drive, or
zip drive) so that you have ALL your current drivers in one spot for
easy installs/reinstalls.
(many techs recommend a full format/reinstall every 3 months.)