First: No need to shout (typing in all CAPS means you're shouting)
Second:
Setting gridlines in Page Setup only impacts printed sheets.
Try this:
From the Excel main menu:
<tools><options><view tab>
Check: Gridlines......Click [OK]
If that doesn't work, you probably have a background pattern set on the sheet.
So...try this....
Select a range of cells
<format><cells><patterns tab>
Click on "No color"
Click on "Pattern" check:Automatic
.......Click [OK]
Does that help?
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Regards,
Ron
XL2002, WinXP