Hi there,
I was having the same issues as some of you have with their macs. Specifically:
My mac turns off by itself as I turn him on, or during boot (initial part of boot).
My Mac show me a message that battery is damaged (and it only have 294 charge cycles).
The magsafe led light sometimes has issues (don't turn on, or turn on green when shoud be orange, etc).
The mac sometimes don't charge at all, but usually, restarting it resolves this.
So I called Apple Tech Support and my mac is now fixed, (all issues above).
So the instructions they gave me were:
Resetting SMC and NVRAM (MacBook Pro 2009 and later)
Recommendation to perform a reset to SMC and NVRAM. First SMC and then NVRAM.
I - SMC
1. Turn off the computer.
2. Connect the power adapter if it is turned off.
3. In the built-in keyboard, press the left Shift key + Ctrl + Alt and the power button simultaneously and continuously for at least 10 seconds.
4. Release all buttons and the power button simultaneously.
then with the computer still off:
II - NVRAM
1. Locate the following keys on the keyboard: Cmd (⌘), Alt, P and R.
2. Turn your Mac on pressing the power button.
3. Hold down the Cmd + Alt + P + R immediately after turning on the Mac.
4. Keep pressing these keys until you hear the startup sound for the second time (strident "beep").
5. Release the keys.
Later I realised that the symptoms were the same as described in a Support Apple page (about SMC) which I quote:
After performing normal troubleshooting, these symptoms may indicate that an SMC reset could be necessary.
The computer's fans run at high speed although the computer is not experiencing heavy usage and is properly ventilated.
- The keyboard backlight appears to behave incorrectly (on Mac computers that have this feature).
- The Status Indicator Light (SIL) appears to behave incorrectly (on Mac computers that have an SIL).
- Battery indicator lights, if present, appear to behave incorrectly (on portables that use non-removable batteries).
- The display backlight doesn't respond correctly to ambient light changes on Mac computers that have this feature.
- The computer doesn't respond to the power button when pressed.
- A portable Mac doesn't appear to respond properly when you close or open the lid.
- The computer sleeps or shuts down unexpectedly.
- The battery does not appear to be charging properly.
- The MagSafe power adaptor LED doesn't appear to indicate the correct activity.
- The computer is running unusually slowly although it is not experiencing abnormally high CPU utilization.
- Application icons may "bounce" in the Dock for an extended amount of time when launched.
- Applications may not function correctly or may stop responding after being opened.
- A computer that supports target display mode does not switch into or out of target display mode as expected.
- A computer that supports target display mode switches into or out of target display mode at unexpected times.
The illumination around the I/O ports on a Mac Pro (Late 2013) does not activate when you move the computer.
Sorry about my english.
😉