the cable may be broken. its a little awkward but you can reach the hood latch from under the trk. you have to get down and under and reach up between the grille and the radiator. feel for the latch and trip it or you can use a 13mm socket and take the 2 bolts loose that hold it.
Can you hear the latch release? If so, pop the hood right above the latch with the palm of your hand. It might come up. Then wd 40 the crap out of the latch.