Well, hard to tell the exact cause without seeing it, but if you mean the hood latch itself, you may have to reach up from under the engine bay and release it manually, remove it and replace it, any good auto parts store would have or could order one. If it's the cable, you could try pulling it with vise grips or pliers - assuming it's even reachable. Best case scenario, the release handle has just separated from the cable, could be re-attached or replaced easily enough. If you manage to open the hood, get someone to pull the release a few times so you can find the cable, follow it both ways and you may find the problem. Wish I could be more help, good luck.
SOURCE: 1999 cadallic deville how to open hood broken cable
You can find the cable with a little effort. It comes out of the firewall so see if you can find enough of the end of it still sticking into the cabin to pull. Otherwise you can also look under the car and you should be able to get to it from there. Hope it helps!
SOURCE: 1988 hood latch will nor
hood release is easy.make a tool - buy small steel rod from hardware store.1st bend 1 inch slight hook2nd bend 3 to 5 inches at 60 degrees anglefold over the handle twice and tape.slide in fish and pull. it opens easy and i can get it within 10 seconds.look at pictures. you need a stiff rod so don'i use a hanger and buythe steel rod same *** as a hanger -thin. bend in vice.so easy. 
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.
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