Q: Having issues with car not starting.

Ok, here's the situation. I have a 2006 Saturn Vue. One day I went to start it up, turned the key all the way over, everything lit up, radio worked, air, all that....but it wouldn't start. I wasn't making a clicking noise or any noise at all when I turned it, just wouldn't start. I kept messing with it, and it finally did start. Later that day, I went to start it again, and this time not only would it not start, but nothing came on(radio, air, etc, etc...), and this time I was hearing a repeated clicking noise. Well, I had my brother give me a jump, and we got it to start. I took it to Auto zone to have the battery, alternator and such checked, and everything checked out 100%. This was about a week ago, and since we charged it using the jumper cables that day, it's started like a charm. However, I went to start it this morning, and it DID start, but the radio did not come on, it was just blank, dead. A few minutes later it started working. Please help, thanks! :)

My car has 173453 miles.
My car has an automatic transmission.