My MacBook turns on (fan spin) but NOTYHING on screen
My daughter Mabook (A1502) often wont turn on untill the battery is unlugged, Its been getting worse and worse lately, what could the problem be, the Macbbok appears to have power BUT nothing on screen, when I unlug and replug the battery It turns on again.
When i connect it to a external monitor when the WScreen doesnt work it DOESNT show anything there either
If you can get it to startup one more time let's try test the battery out install this gem of an app CoconutBattery take a snapshot of the apps main window and post it here for us to see iFixitでの質問に画像を追加する方法 Give the systems age you may just need a new battery
Let's also try to run the onboard diagnostics. Restart your system and press the D key. Did you get any error codes?
Reference: Mac startup key combinations
Dan さんによる