RE: What happens when the 'computer' goes bad? Please help
The computer is the heart of controlling the engine operating management and transmission. The main computer also known as the ECM is the "main Frame" of the system, but there a number of other modules that are connected to the main computer.
I think the first thing I would have done is hook the vehicle up to a scanner. The ECM is what turns on the Check Engine light, so if it is dead, probably why no light.
At this point, I'm afraid you are at the mercy of the dealership.
That's not to say that it isn't something else like a bad fuel pump, but you'd have to be in a position to do some diagnosing on your own.
Ask LOTS of questions at the dealership, and ask for the bad parts back, even if you end up throwing them away, there's proof that the part was in fact replaced.
I feel for you, as I've been in your position too. I lost a fuel pump on a trip out west, and got stuck in Oklahoma with a bad fuel pump just after filling up at a service station along the highway, with the bed full, and a pop-up camper in tow. 70 mile trip on the hook, 3 days later, and a $1000 and we were up and running again.
If it is the ECM, get out your wallet, it gonna hurt!!!!!
They should have it diagnosed in a very short time.