Ah, the infamous "invisible" or solid gray background state. Excel is open, the ribbon is at the top, but the grid lines and the data itself are entirely missing.
This usually happens because the workbook window itself has been set to a "Hidden" state within the application workspace, or Excel failed to render the layer when double-clicking the file icon.
Here are the 3 fast fixes to bring it right back:
1. The "Unhide" Window Trigger (Most Common)
Excel has a native feature that allows you to hide an entire workbook frame while keeping the program running. If it was accidentally saved like this, it stays invisible every time you open it.
- In the top ribbon, go to the View tab.
- Look in the "Window" section and click the Unhide button (it looks like a window behind a sheet).
- A small box will pop up listing the hidden workbook. Select it and click OK.
2. The Accidentally Hidden Columns Slip-up
If she can see the sheet tabs at the bottom, but the main screen is just a giant gray abyss, she might have accidentally hit a keyboard shortcut (Ctrl + 0) that hid every single column on the sheet.
- Click the Select All triangle button in the very top-left corner of the grid area (where the column A and row 1 headers meet).
- Go to the Home tab on the ribbon.
- Click Format (in the Cells group) $\rightarrow$ hover over Hide & Unhide $\rightarrow$ click Unhide Columns.
3. The "Ignore DDE" Bug (If it opens blank only when double-clicking a file)
If Excel opens completely blank and gray when she double-clicks an actual spreadsheet file from her desktop or File Explorer, but works fine if she opens Excel first and goes to File -> Open, a hidden setting is blocking the data handover.
- In Excel, go to File $\rightarrow$ Options.
- Click Advanced on the left menu.
- Scroll down until you find the General section.
- Look for "Ignore other applications that use Dynamic Data Exchange (DDE)".
- If it is checked, uncheck it and click OK.
Give the View -> Unhide trick a look first-nine times out of ten, that's the culprit!