Cars acting wierd...dunno what it is?

[tnm27]

alright so here's where my car lies. i have a 91 eclipse gsx. just rebuild the motor about 2 months ago. at first when you start the engine it goes to 2000 rpm and than starts to idle after about a min. than the check engine light goes on. today i relieved the fuel pressure system so i can take my fuel filter out. just being curious i decieded to replug everything in, after that the car just wouldn't start. it doesn't crank or anything. the starter clicks but nothing else, the battery is still alive as well. i dunno what it could be. i had this problem before but i put a new ecu in and it started but i don't know what it is this time. another quick question is that my headlights don't flip down for some reason, the lights were up when i bought it but it won't go down. any advice would be appreciated. thanks.