Hello David,
It will obviously depend on the logic that you want to be valid but the following works in a cell which shows text if the condition is true and is blank if the condition is false. The # in the hyperlink address indicates that it is in the current workbook. If you wanted to navigate to another workbook you would have to supply the full path.
=IF(AND((A1="a"),OR((B1="b"),(C1="c"))),HYPERLINK("#'Sheet2'!A1","Now you can go"),"")
Hope this helps.
Harry