We have a Radiant 1520 that quite working recently. You can push the power button and the screen will immediately flash(power on), you can hear the hard drive spinning, LAN indicator(s) are illuminated and the power led lights up however that is all. First thought was the backlight went bad in the screen, so we changed the top of(screen, card reader, etc) with another working 1520 terminal with no luck. Exchanged ram, hard drive, and cables with same result bringing me to the idea it is the actual motherboard. I looked over the caps and I don't notice any of them that have exploded or overgrown. Is it safe to say it is the motherboard? If so what model is it? I looked on the board itself, but any serials or models I tried didn't return any results on Google.