[FIXED] How to change a cells colour based on a cell on a seperate sheet being empty

Issue

I'm struggling to nail this. I'm trying to use conditional formatting on google sheets to change the colour of a group of cells based on a cell in a different sheet being empty.

So for example I have a sheet called "Controls" with an empty cell, M13, to write a persons name. Once that cell has had text inputted I would like a group of cells, BE2:BN25, to change colour to white so as effectively 'unlock' them for data entry.

I've tried =NOT(ISBLANK("Controls!M13")) but it's not changing colour once some text has been entered to that cell.

Is this possible on google sheets or am I just making a glaringly obvious error?

Thanks in advance for your help.

Solution

try:

=NOT(ISBLANK(INDIRECT("Controls!M13")))

Answered By - player0

Answer Checked By - David Goodson (PHPFixing Volunteer)