Sounds either fuse, ECU or random electrical related,
There's a few fuses that effect main relay operation (31, 37, 14, 2). Check the ground on the main relay, (ground g101).
Make sure you're checking the engine bay fuse box and the dash fuse box.
Get a multimeter, and the workshop manual and use the wiring diagrams to chase the wiring and see which component isn't allowing voltage through it when you turn the key to start.
Either google the manual to download it's called 'CRX workshop manual', or PM me your email and i'll email it to you when i get a chance.