2007 jeep cherokee wont start. All lights, radio, fans work but when you turn the key nothing happens, no clicking, nothing. The Transmission over temp flashes quickly when you turn the key to off. happened 2 times first time a jump worked second it did not.

Read this post about a lot of electrical problems. It will give you an idea on what to look for.
https://www.cnet.com/forums/discussions/the-famous-jeep-grand-cherokee-electrical-problem-272172/5/
When it does not crank, check to see if voltage is getting to the starter. If it is, hit the starter. If it starts , replace it.

You need to check the ground between the engine and body

Seen this happen before, A guy had bought a brand new jeep cherokee, the second morning it would not even crank or turn the motor, he had a faulty key switch, could be your problem as well...

I have found the solution to this problem. I have replaced a total of 3 starter motors and has gone away for various periods of time. Further diagnosed when concern happened again starter
would work again after starter ignition feed wire wiggled. I found corrosion build up in connector at ignition feed wire. I replaced connector on wire to starter solenoid and concern has not returned.

Problems could be the starter, you could switch the transmission to try to put the transmission in neutral and see if it gives start and also problems with the immobilizer or the starter relay you can remove and make a direct connection and are sure is not the starter. thanks

My man I know your pain... I have the exact same problem happening to me now... same make, year and model... I called a mechanic buddy of mine and he said I might have a "flat point" on my starter and if so this might happen intermittently... he suggested a replacement of the starter... But I think the other suggestion is also quite valid so I going to have my friend do both...

What is the current status? I purchased a 2007 Jeep Grand Cherokee from CarMax in December, 2009. The first time it wouldn't start was the beginning of March. The dealership could not duplicate the issue. Happened again a month later, they said it was the wireless remote module and that was replaced. Couple months later, happened again. They said it was the key module. That was replaced. Friday night, happened again. I'm waiting for a tow truck Monday morning. Does anyone know the real underlying issue and the resolution?

First, make sure you can turn the engine by hand. If you can't then the starter can't turn it either. Have someone else turn the key and look for the source of the click...may be a relay. Go over the starting circuit with a volt meter. Check for power at the starter main terminal and then with the key turned to "start" check for power at the trigger terminal on the starter. Check battery voltage and check relay operation.
You have a neutral safety switch on the transmission if its an automatic and a clutch switch if it's a stick. Check them as well. Make sure battery grounding on fender and block are also clean and secure.

does your light dim when you try to start it?Check ING fuse under hood.

burn it!!!!!!