Got a 98.5 Contour SE 2.5L/MT 120K miles...had a simple, minor problem. Fixed it myself...now it's got a very major (?) problem.

Was bucking and missing - replaced plugs, wires, and MAF (lotsa lean trims stored...flow chart said do it). Of course, had battery disconnected during this not-rocket-science procedure. Buttoned everything up, reconnected battery, and...partial darkness featuring no starting or running .

When key first turned to RUN, got no I/P lights, but did have clock and PATS light. PATS light, curiously, blinked a few times, went solid, then slowly faded to black over about 5 seconds. Now, there's no clock, radio, or PATS light, no I/P lights, no click or crank in START. Remote keyless door locks work fine, footwell lights work fine, but that's about it.

How could I have screwed up connecting the battery? Anyone seen this before? Is there a single point of failure that would explain this group of symptoms?

Wondering in Denver,
-pmb-