First thing I'd look at is:
Tools|Options|Calculation tab|make sure it's set for automatic.



cbrd wrote:

I have a cell with combo box (data validation). When I choose an item
from this drop down list, It puts a number in cell G10. When there is a
number in G10 and I press ENTER on the keyboard, various other cells in
this sheet do a "LOOKUP" function on different sheets throughout the
workbook. What I'd like to know if there is a way, when a number is put
into G10, that excel will "enter" it without me having to press the
ENTER key on keyboard?

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cbrd
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Dave Peterson