Civic EG

So heres the deal I got a stock cx hatch, I was about to do a motor swap, so i took out the running motor and few a days later decide not to swap and put back the cx motor. now its is not starting. I had check the spark plugs/wire that i bought new, fuel, fuse, distubutor, alternator, starter, new battery.. what else could it be? any help

are all the grounds hooked up? (engine, tranny, thermostat?)

ecu plugged all the way in?

can you hear the fuel pump prime?

all ground, all plugs were check and ecu was plugs in. i can hear the fuel pump prime.