Sounds like you could use to start by reading some of the stickies such as this one(above)
i need some help please
i want to connect my home pc and leave it there and not have to touch it ever just like a normal HU but with more options
1. to run my home pc at the car i need a 12v to 220v converter?
2. what is going to tell the pc to switch on and off?
3. and the last problem - when the computer is switched off but still connected its still taking power i think