I have my friend's Macbook to install some software and what not. Last night I was just finishing autocad and I closed it to sleep. Tried booting it up this morning to finish up what I was doing - however the laptop's power light just quickly blinks once, won't turn on. What the hell happened! After trying to get it on repeatedly, it booted for a half second, and turned off just as quickly. Can't get it to do that again.