(This cell is also selected even though it appears white).
Selecting entire Rows, entire Columns or all cells on the worksheet.
To select an entire column, click on the letter for the column header. To select several columns, click on the header for the first column and drag to the right.
To select an entire row, click on the number for the row header. To select several rows, click on the header for the first row and drag down.
To select all of the cells on the spreadsheet, click on the upper left hand corner of the spreadsheet (where the column headers meet the row headers)