I posted a question (https://forums.macrumors.com/threads/717892/) its me asking why the power cord isn't working and then my MacBook was at 10% and now its dead. I do back up my Hard Drive with an external by just droping a copy of the whole Macintosh HD on the drive. so could I boot up Mac os on my moms dell, I would try it myself but I don't want to mess up her computer. I know how I could do this I've done it before with an Ubuntu CD on her computer.