cbergstc

I just bought a used 2001 Honda Accord. At first the security system would activate as soon as I locked the doors. But a rear door latch was broken and the thermostat had to be replaced. After fixing both, the hood is closed, although it wasn't closed completely, and I had to slam it shut twice before it was fully shut. The rear door can now be opened from the outside, although the button inside doesn't seem to go all the way down when locked like the other three doors do. Ever since those repairs the security system won't set. Why would that be? Is it the hood latch or the rear door? How do I fix it?