Thread: ATX Motherboard... power supply questions

So much info, not sure where to begin.

I have a P3 ATX motherboard (not Mini ATX, not Micro ATX... a regular desktop PC motherboard).

I want to put it into my trunk next to my amps (no problem). The problem that I have is where do I start with the following:

1. What power supply do I use?
2. I would like the ability to have a on/off switch up where I drive, so the PC has to be able to support this.
3. Concerns about power drain on the battery.

I currently have the power wire running to my amps so I know I can connect into there..... somehow.

Any help would be GREAT!!!