Hi I have a 2000 Saturn sl 4 door saden,is a 4 cylinder with 1.9L manual trans. My problem is this past summer I drove the car fine one day and I got home parked it and the next evening I went to start the car and it would not start.it was late and dark and I was in a hurry and went to jump it and then after a couple second I noticed grey smoke come up from the jumper cables and I hurried and disconnected the cables.well the cable was fried and then I telized on the Saturn battery I had hooked the cables up backwards.every sense the car will not start.i took the battery to my local auto store and had it tested in which they said was fine.i didn't hear the fuel pump engaging like I normally could so I got one from a salve yard incase that wasn't the problem.after replacing still wont syart or hear it engage.all fuses in the car are good and from what I could tell the ones under the hood in the relay center are good as far as I know.when I crank the key on the starter try to start but I noticed my dash lights flash while turning the key.tryed even starting with starting fluid with no success.also I noticed the battery does not stay charged so in order to even get the starter to crank any I have to have jumper cables on it to get power.also i cant find any fuel reset button in trunk to see if thats the problem.any help would be greatly appreciated.

You cooked ****. Probably fried the ECU. This is above and beyond your level of diagnostic. Take it to a dealer and let them figure it out.

Check all fuseable links.
Chances are Mike is right...."You cooked stuff".