1999 kia sportage will not start Turn key and no sound at all all lights work Battery is fine fuses are fine?

Automatic transmission interlock - try with foot on brake and emergency brake set holding the ignition switch in start position, shifting transmission from park to neutral and wiggling it around. If that works, could be adjustment or bad interlock switch.

Manual transmission, clutch safety interlock may be bad.

Ignition switch bad?

Wiring to, from starter relay or solenoid bad?

Previous owner wired secret start lockout switch under dash and your 2 year old found it without telling you?

... Grapeguy