It is a little scary but you can find a nifty little power supply that replaces a slot in the back of the computer and plugs in to the computers power supply. it has 8 terminals for power. I used a couple of these when I first started this business and powered 8 cameras with the computer (w/ 550w ps) that was set up for cctv. But then I thought better and decided not to use them any more. What if there is a short? check it out @ www.sonerik.com. I have a few left @ $20 each if you are interested.
Jay