When you select the cells before you go Format>Conditional Formatting, make sure you select cells from the A column to the AC column and then use Norie's formula (exactly the same, no different).
Take us through exactly what you are doing. This should work:
Click on cell A1 and -holding the left mouse button down - selecting all cells up to column AC and down to say row 20 (for the sake of testing), then go Format>Conditional Formatting.
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