1992 teg won't start help please

I'm having problems. my teg won't start, it cranks over but no spark. The distributor has power but no spark. It's at the shop but the mechanic can't find why there's no spark. The icm has been replaced everything in the distribuator checks out fine, it has power but there's no spark. I've been on foot for a week now. Can anyone out the help me. I've read in this forum that the main relay may be the problem, the little brown box under the dash that contains two relays within one. How does one check to see if this is the problem. Help, Help, Help, anyone out there have any suggestions on what my tegs problem is.

A couple of my friends have g2 tegs also. One of them had a bunch of trouble with the main relay. If you want help for the specific car, I would refer you to honda-tech.com or g2ic.com g2ic is a g2 teg specific website. There is plenty of help there. Honda-tech goes over every honda you can think of. Honda-tech is much bigger, but not as specific to the g2 integra.