can anyone tell me is thier a way to wire a atxpower supply to a car to power a smallformfactor pc and a touch screen? Answered

yeah, you have to use an inverter, check this out:
http://www.ebay.com/sch/Power-Inverters-/58020/i.html

good luck

Switch out the inverter, and use a DC-DC power supply

http://www.mini-box.com/DC-DC

You could probably use the 12V supply from the car, in some way (without the ATX PSU).

L

There exist ATX power supplies intended to be powered from a 12 volt battery, intended to be used for with car computers.

I think using an inverter, together with a ordinary mains powered ATX power supply, will waste power, and produce a lot of 60 Hz, and 120 Hz noise, you do not want.

The links below, I found via a Google(r) search using the words:
car + computer + 12v +atx
(http://www.google.com/search?hl=en&q=car+computer+12v+atx)

http://store.mp3car.com/M2_ATX_160W_Intelligent_DC_DC_PSU_p/pwr-015.htm

http://www.mini-box.com/M2-ATX-160w-Intelligent-Automotive-DC-DC-Power-Supply?sc=8&category=101

http://www.powerstream.com/DC-PC-12V.htm

With the right inverter you can wire 3 or 4 PC to a car. Though it will be a heavy strain on the car's electrical system. If the alternator isn't able to keep up you can kill the battery pretty fast.