Howdy y'all, I have a hand-me-down MacBook with a dead battery. After several instances were the power cord was unplugged, the OS won't boot. what plainly happens is... startup gong and grey apple as usual - then goes to black DOS-looking screen with two specific errors: /etc/master.passwd: no such file or directory and CSRHIDTransitionDriver::stop I have read countless articles and forum threads on the issue and have typed all kinds of commands. There seem to be lots of things you can do if you want to save the contents of your HDD. This is a hand-me-laptop, there are no files I need to keep. I would to reinstall the OS and I don't care what get's deleted in the process. However, I can't boot from the install DVD, or boot into single-user mode, or zap the p-ram, or run a hardware test. all startup options end with the same errors as mentioned above. thank you in advance to anyone who can lend me some advise.