Hood won't open. Cable is broken and can't get hood to pop.

Normally, the cable snaps off from behind the cabin release lever. In that case you can pull the cable end with Locking Grips. If it has broken at the hood end, and they have a history of it, there are videos in the link to get in through the grill.

https://www.google.com/search?q=2012+Nissan+Murano+hood+won%27t+open+after+pulling+hood+release

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Have someone press down on the hood with their palms while you try and release it, if it does open lube the hood latch with white lithium grease AKA "Lubriplate".

look under the dash see if cable is broken close to that end
grip inner cable with pliers and pull hard

if broken at the engine bay
work from under the car with a long tool to release the bonnet catch

if not sure how its done drive to a panel repair shop for a solution

If the plastic hood release handle inside is broken, can you reach the steel cable, if so, use a pair of vice grips to grab the cable and pull. Sometimes it helps to have a helper standing at the end of the hood and pop the hood with palm of hand, in the area of under hood release mechanism, at the same time your pulling the cable.

If cable is broken, some makes and models, you can remove front grille and get at under hood release mechanism.

There is usually a primary hood release, inside vehicle, and a secondary release under the hood, you have to slide your hand under the hood to release, sometimes you have to press down on the hood a little to move release. Trying to shut the hood with secondary release engaged can be difficult, you don't have the distance and the weight of hood to swing down.

Check out the cable connection between the latch and your internal latch control. Till you locate the problem I would suggest tying down the hood with some sort of strap so it does not pop open at speed.

It may be that your hood release cable that runs from the hood release is broken. You'r going to have to try and manually release the hood latch by tripping the release through the grill with something like a long screwdriver. You should be able to identify the latch trigger by following the cable to end.
You might also try having push down on the hood while another person tries to trip the latch if the cable isn't broken, but just stuck.

take off the left front wheel and fender well. slice off the hood cable insulation get a hook too pull the wire have a buddy pull up on the hood while doing this. Should pop open then hope this helps u out.

The cable is held in place by a metal bracket. If it cam off the bracket it won't work.

Look behind the part you pull and you will see the wire and the outer part of the cable. The end of the outer part of the cable has a groove neer the end. This groove slides onto a slot that is located just behind the pull latch. Once you see it it will make since on how it should go.

You can also grab the outer part of the cable and pull the inner wire. If you can pull the wire almost out, then it is broken. But the chances of that are very low.

If the cable link to the latch is rusty or broken you have to take the front grid down. It's relatively easy. It's held there by plastic fasteners. Then reach for the latch with you hand, or the leftover broken cable. Pull it, it should release the first latch, than you just have to get to the security latch, like you usually do to open the hood.

You will need 2 people to get the hood open. While you pull on the hood release cable have an assistant gently pound on the center of the hood until it pops up. If this does not work, inspect the hood release lever to see if the pivot broken, if so pull directly on the cable with a pair of locking pliers. After you get the hood open make sure to spray the latch with penetrating oil (WD40)