Locating the first empty cell in highlighted section

Can someone please give me a macro to highlight the cells Range("A4:S35") and find the first empty cell in that selection while keeping the Range highlighted.

That gives me the next blank column. Is there anyway i can get the next empty cell going form top to bottom of the page in the highlighted area? Could i just have the cursor on the empty cell and no message box. Sorry i wasnt more clear. Thank you very much

This will be perfect if you could have the cursor land on the first empty cell. It is still starting on the top of the next column

same principle just loops through the columns rather than the entire range at once:

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Exactly what i wanted. Thank you very much