Just completed rebuild of my 06 after it has sat for several years. Fired engine for first time this morning. It started normally, i could hear relay, fuel pump prime, etc. It sounded great, oil pressure and all looked good. I let it warm up at fast idle for a few minutes. Then varied rpms gently. Still good, so set idle back down to about 1200. Pretty happy at this point, but then it just quit. No cough or sputter, just shut off instantly. I turned key off and back on. This time no fuel pump prime noise and even no numbers/info showing on dash, completely blank. Did my ecu just die? Any suggestions what to check? I've never seen a blank dash.