2007 prius woes

I bought this car in dead condition back in April. I finally got it running and all cleaned up. I was going to give to friends who need a car, but that plan hit the skids recently. The first thing that happened was that the alarm system seemed to go nuts, it went off at random times. I pulled the horns to cut down on the noise so the neighbors could sleep. I was planning to have the alarm system turned off by using the Toy Techstream application. Before I could get to that the flashing iights managed to kill the 12v battery. I put a charger on and got things back to operational status. That happened earlier this week.

The next thing that happened was that the lights in the speedo cluster went dark when I started it up on Nov 26. The backup camera also failed to trigger and appear with the dark cluster. Everything else seemed fine, the car ran fine for an errand. I have done the capacitor repair on the cluster before and I thought that had suddenly become necessary on this car. I drove the car with the dark cluster to complete an errand and I turned it off and hoped for the best. It seemed like a normal shutdown, the multifunction display turned off, etc. I started the car after the errand and it was the same as before, no speedo display, but everything else fine. When I got home, it would not shut off. The multi function display stayed on unless I switched it off, but the engine ran every minute or two, so it was obvious the car was in "Ready" mode and could be driven away. I disconnected the 12v battery and that made no difference. The car continued to start the engine every minute or two. I finally managed to turn the car off by holding the start button and the park button down at the same time for several seconds.

I figure that somehow the crazy alarm system and the inability to shut down are somehow related, but I don't have a clue where to start to fix that cluster of problems. Plus, I have the capacitor replacement job to do on the speedo cluster. Has anyone run in to something like this? Is there a chance that replacing the capacitor in the speedo cluster is going to fix all these problems? I am getting really tired of this car.

Thanks for any ideas.

Mike