It could be a connection fault, have your checked to see if the fuel pump is getting voltage? A significant drop could cause the no-start condition. If it were me, I'd pull out the injector, and keeping it connected, crank the motor over and see what the spray pattern looks like. If it isn't a fine must, replace it. If nothing comes out, it might be a fuel pressure or electrical problem upstream. Checking power to the injector requires a good pwm meter, so I would save that for last.