Weird Lines on the Screen

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Version: 2008
Operating System: Mac OS X 10.5 (Leopard)

Before I go back and complain to Mac that my laptop is broken yet again (so far in its first 3 months of life it has had to have a new Airport card and a new top case - grrrr!), has anyone else encountered strange lines that appear on the screen in Word documents?

They are little vertical lines that stay in place as you scroll the document underneath them. I'm also having issues with bits of text, especially at the ends of lines, not displaying properly. The text is there, but you can't see it or parts of the letters are missing unless you highlight it or add a carriage return, when it suddenly reappears).

I'm not doing anything complicated with colours, tables or pictures, nor is it a big file (less than 1,000 wds) although I have been using automatically numbered lists. I tried copying and paste special-ing the text to a blank document and reformatting it, but that didn't help.

thanks
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