原帖由： Dan ,
Sounds like he had it lying around for awhile before he decided to sell it. If that is the case you may need to reset the SMC. Follow these instructions: [http://support.apple.com/kb/HT3964|Resetting the SMC]. Also make sure your battery & charger are working. Next, try an external monitor to see if the display has gone on you. And lastly, reseat the memory modules.