Car has lights but still won't start!

I've had the battery, starter, and alternator checked
and they appear to be good. Had them checked at
Oreillys. All the lights on the dash works. Changed
out ignition switch, fuel pump is good. Everytime I
turn key, there's a click from the fuse box under the
hood and on passenger side. Bought a new relay
and swapped them out, still nothing. I've also tried
taking the starter wire and putting it to the battery, it
try's to crank but just won't turn on over. I'm all out
of options. I'm really hoping it's not a computer
issue, I was told that's pretty expensive!! Please
help.