Why isn't my car starting up?

Ok so I have a 2007 ford taurus se and last afternoon I tried to start my car and no lights came on and neither did the.engine. So I took the battery to get tested and it was working great. I then took the starter to also get tested and It was working perfectly fine. After putting everything back on the car it seems to be running fine. It's also worth mentioning I got broken into last week and got the ignition replaced but when I turn the car off the radio would stay on? Maybe this has something to do with it. I'd really like to fix whatevers wrong before my car ***** up again. Any suggestion helps.

Have ignition replaced again. Take it where you took it and tell them about radio staying on and it didn't do that with old ignition!

If the radio stays on, the circuit is grounded out making it run constantly and draining the battery fast. You need to pull the radio out and physically examine the wiring for any broken areas that maybe have been contacting the metal frame inside the cavity for the radio.

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