Hey. Sorry for the late post, the forums have been near dead for a while.
Does your NES reset repeatedly? As in it shows the title screen for 1 sec and then reset? If so, sounds like it would instantly be fixed by disabling the lockout chip... I found a
video (crude way of doing it though..) and an
instructional site (can see the pin a little better). Very easy to do.
If your NES is resetting at random, then that is an entirely different problem. Post your findings, be it good or bad.

"So this is how I get demoted to canning fish every day until I die!"