I can't print the gridlines in my table.
The table gridlines are there only for reference. They never print unless you apply borders. If you don't need to see the gridlines on screen, choose Table » Hide Gridlines to remove them from the display and help eliminate any confusion.
If you want to print gridlines, add borders to the table. Right-click in the table, choose Borders and Shading from the shortcut menu, select the borders you want on the Borders tab (see Figure 7-6), and click the OK button. The key control here is the "Apply to" drop-down list, which lets you specify whether to apply the current border to the entire table, the current cell or selected cells, or the current paragraph.