Do a conditional formatting in cell A1, and use an "AND" formula to reference all the cells that need a check mark...
On Cell "A1", do the following:
1. On the Conditional Formatting options, choose "New Rule..."
2. Use the last option: "Use a formula to determine which cells to format"
3. Use the following equation: =AND(C1 = "blah", D1 = "blah", E1 = "blah") ---NOTE--- instead of "blah", enter whatever you use to identify the cell as being checked.
4. Edit the format however you'd like.