Exorion

Hello, I'm wondering what the common symptoms of a dead ECU is? So far for my 93 I get no CEL light when the key is on and I get no spark. I've checked the igniters and they work. All relays and fuses look good. CEL came on once but never came back on after a new battery and reconnected a few sensors. Previous owner said he had the ECU recapped some time ago but the car has sat for nearly a year since he couldn't put it back together. Said it ran before it sat.