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Hi I asked a question before but I got the model and year wrong so figured I would post a more accurate question. my macbook has worked fine for years but now only loads half and shuts off. also when I go to do self repair it says it cannot repair itself. how would I go about fixing this problem?

Could be several things. Try a Safe Mode boot by holding down the Shift key on start up. Next try a PRAM reset. How to Reset PRAM or NVRAM Power off your Mac.Press your Mac’s power button and then hold these four keys at the same time: ⌘ + option + P + R.Continue holding the keys until your Mac restarts for the second time. On older Macs, the chime will sound upon restart.