Thanks for your help - in fact I've now fixed it.
For the record here is what to do.
Install Fedora using text mode.
After the reboot, the graphics mode setup kicks in, this is still usable but is tiled as the resolution is 800X600
check the actual screen reolution by referring to manual and checking the product code on the underside of the PC.
http://h20000.www2.hp.com/bizsupport...&lang=en&cc=us
» Compaq Evo Notebook N1020v Series, N1000v Series and Compaq Presario 1500 Series Maintenance and Service Guide
Change the monitor type e.g. to "LCD Panel 1024x768"
Reboot as requested.
After the reboot, the graphics mode setup kicks in, this is still usable but is tiled as the resolution is 800X600
Now change Display the resolution e.g. to 1024x768
After completing the remaining setup screens, the screen will go black then the logon page appears.
At this stage the screen appears normal and the tiling affect has gone.
Peter