ABSOLUTELY NO POWER WE'VE CHECKED JUST BOUT EVERYTHING. MY QUESTION IS COULD IT BE THE COMPUTER AND IF COULD BE RESET

You may have pulled a fuse on the security system and immobilizer. If that is the case, you need to reset.

https://www.google.com/search?q=2004+jeep+grand+cherokee+security+reset

..

Check your battery, those I believe have 2. Check the connection of the battery. If it’s nasty and whitish and green, get a metal brush and clean everything. Of course unplug the battery terminals first! Anyways, make sure you check to make sure you replaced both batteries because I’m pretty sure there’s one under the hood, but also in the trunk. Each controls totally different things, but both are needed to start the vehicle. Under the hood battery supplies power to certain engine computer components and exterior lighting, and the trunk battery supplies power to most interior controls, and even some engine components.

Also, check your ignition coils too. Make sure they are in the correct firing order and are all good too. Double check your work. I’d need a bit more info, but, does the car try to start and just won’t turn over? OR, you try and absolutely nothing happens?

These aren’t the most reliable cars, just being real with you. I’ve seen problems with fuel management in the 7 series in general too, so maybe last resort check into that.

Hope this helps you man. Good luck with the 740iL

Have you checked the engine computer for trouble codes ?

normally using a code reader to reset the CPU will fix any corrupted programs

Failed ignition coil most likely.
Other causes...sparkplugs, HT leads.

noise is at stop,put in neutral check if no noise,could be heat shield.

You should have power to the dash if the key switch is working.
The main fuse would kill everything in the car.
Depending on how it happened, I would check the fuses and then check for voltage at the key switch.

what exactly is the question ?

First you need to get the trouble code from compute,my wild guess would be mass air flow sensor.Take sensor off and clean it with a non-chlronated brake cleaner put it back on then reset computer.Make sure you get the codes out of the computer first.

check to make sure your battery is bolted down securely and its possible that when you throw it hard left its moving around and you"ve loosened the battery cables.