Powerpoint 97 or 2003 flickers on screen

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Good day,

We have a Dell Inspiron 9200 notebook running WinXP Pro w/SP2. Each time we
toggle the external monitor device by pressing Fn+F8 (doesn't matter if a
monitor or projector is plugged in), our PowerPoint file view will expand to
400% and the images will flicker. Tried changing to 100% or other settings,
it will not. Found out this happened to PowerPoint 97, 2003 and also to Word
2002. With Word, the file view mode will change to 500%.
Notebook BIOS upgraded, video card drivers upgraded, motherboard, video
adapter and even the LCD screen replaced but same problem. This tells me it
is a software problem. Can someone help please?
.