Are you sure the cells are empty. A cell may be "false empty" if it contains
a space character.

Try this:

For z1 = 7 To 1300
If Trim(Cells(z1, 9)) = "" Then Cells(z1, 10) = "HI"
If IsNull(Cells(z1, 9)) = True Then Cells(z1, 10) = "HI"
Next z1

Regards,
Per

"Rpettis31" skrev i meddelelsen
...
I have code that I have tried in various ways yet I can not get the code to
recognize a blank cell.
For z1 = 7 To 1300
If Cells(z1, 9) = "" Then Cells(z1, 10) = "HI"
If IsNull(Cells(z1, 9)) = True Then Cells(z1, 10) = "HI"
Next z1

I only used the word hi to stick out on the sheet.