2003 tahoe z71

just bought......10 days in and wont start this morning.....wont turn over....just 1click.............not the battery.........help

corrosion on the battery cable either on the post side or the starter side, neg. cable ground broke, bad starter, ignition switch... best thing, check battery connections, at the battery and the neg at the block (i beleve it is on the power steering bracket) check the starter connections, if those check out ok, i would assume a bad starter