I had the same problem. Dome light came on, so it should work, but no trunk pop. All I did was take out the little motor (under the trunk lip) and service it. Apparently, they're fairly flaky, and get jammed easily. There is a good step-by-step somewhere on here.

Try this: http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=trouble&Number=729175&Forum=trouble&Words=trunk&Match=Entire%20Phrase&Searchpage=2&Limit=25&Old=allposts&Main=407409&Search=true#Post729175

It worked for me. total cost zero!

T