OS X Mountain Lion: If the sleep indicator light flashes
It’s normal for your portable computer’s sleep indicator light to slowly pulse (brighten and dim) when your computer is in sleep. If the sleep indicator light flashes (turns completely on and off repeatedly), the computer may need service.
- If you hear beeps when your computer starts up instead of the normal startup tone, and the sleep indicator light flashes, the computer may need service.
- If you don’t hear beeps, but the sleep indicator light flashes five times when you start up your computer or wake it from sleep, your computer may need to be serviced.
You can continue using your computer before it’s serviced. Use a different battery, or connect the computer’s power adapter and plug it into a power source.Note: If your computer has a faulty battery or no battery and then your computer is unplugged, you could lose all unsaved changes.