it's probably something electronic (e.g., theft deterrent system shit to bed). . .however, it could just be the starter button inside your steering column.
is it a stick or an automatic?? if it's a stick, put it in first gear and then get out and rock the car back and forth a little. . .then jump in and try to start it. . .if that works, it's the bendix gear in your starter. . .it's sticking.
if it's the theft deterrent system, they can usually be reset by unhooking the battery for a few minutes. . .the one on my brother's tahoe, you have to turn the key forward and let it sit for two minutes until the theft deterrent light stops blinking.
good luck!