New Mac user, black screen on start up! Password not working after SW reinstall

Re doing this again.......
I got blk screen, reinstalled Mac os x ( had the lastest software up to 2 days ago) and now my password does not work?
I did get a prompt 2 days ago to update but didn't get a chance to. Also had my iTunes acct hacked into. Can someone help?

Foxfire, welcome to Apple Discussions.
A failed internal memory battery can cause the no video. Check this site for battery part numbers and sources. Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
Cheers, Tom

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New Mac user, black screen on start up! Password not working after SW reinstall

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