HT204308: Find the serial number of your Apple hardware product
Learn about Find the serial number of your Apple hardware product
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Q: My macbook suddenly blank when I start up. Now, it won't display the desktop. What should I do?
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Aug 30, 2015 4:12 AMby dominic23,Reset PRAM. http://support.apple.com/kb/PH18761
Reset SMC. https://support.apple.com/en-us/HT201295
Choose the method for: “On Mac notebooks with non-removable battery”.
Start up in Safe Mode. http://support.apple.com/kb/PH18760
Repair Disk. http://support.apple.com/kb/PH5836
