Mac dies when power disconnected

Shuts down as soon as power cord removed. Coconut says it's Any suggestions appreciated.

Tried 5 chimes and the battery warning "Replace Now" did not show up, info looked normal. All seemed well until I took off the magsafe. Computer went off and when back on the warning showed up again. The issue returned MacBook Pro goes dead when Magsafe adapter removed and needs to be rebooted.

But when I got back home and used the newer Magsafe adapter I usually use, no more issue, and didn't have to do the CNET solution all over again.

Do you know why it would make a difference, although doesn't matter as long as it works. It did take overnight to charge the battery the first time which seems long.. Show 4 more comments.

Dan danj. Self employed contract worker. What is happening here is SMC thinks the power level is below the set threshold so it needs to power down the system into deep sleep mode. So how to fix? It's quite simple you need to do a SMC reset and cycle the battery a few times by fully discharging it and recharging it. That way the setpoint is memorized correctly. Here's the Apple TN you'll need to reference: As far as my battery goes, I try my best to not have it plugged in most of the time and give it a chance to fully empty out before plopping the charger back in.

However, I did just open the MacBook up and tinkered with a few wires, which seemingly did nothing. Then I did an SMC bypass unplugging the laptop, holding the power button for 10 secs, plugging the computer back in while holding the power button for an additional 10 secs and then releasing and pressing it again to get it to boot which got it up and running without a charger plugged. Again we can nail this down to magnets and magic. Did you pull the battery connection?

Often I find I end up needing to do it that way to be effective. Pull the battery internally, press and hold the power button a good 2 minutes then plug the battery back in and restart. No magic here and it's not magnets either: It's a problem I've seen a few times so I had a strong idea what was up here.

You may want to clean the MagSafe connector pins and pads. The middle pin is how the charger and the system communicate.

If the cord pins or the DC inboard contact pads are dirty or corroded you can have some charging issues. But given your coconut battery info I don't see this as your issue. Karen D'Souza. Hi, I might have a similar problem. My MacBook Pro shuts down suddenly sometimes when I move it and the charger gets disconnected. It doesn't always happen, so I'm sure that it's not a battery problem.

It turned out it's a problem with my charger. Perhaps it sends some surges of electricity or is otherwise unsafe that the MacBook decides to shut down. Anyway, the problem seemed to have disappeared when I got a new charger. I agree, in most cases this is a charger issue, specifically the L tip magsafe cable. Since my original magsafe disintegrated, I have used numerous compatible adapters and they all develop this issue over time.

When it starts to happen, I just get a new charger. Yavuz yavin. I have a similar problem to the one here and it would be much appreciated if you could have a quick look! In short, my MacBook Air turns off when unplugged, even though the battery is relatively new. I begun having a similar problem after installing a new battery in my MacBook Air, by myself You might be right When systems affected by this issue are powered on while disconnected from an external power source, they briefly begin to startup then power down immediately.

In most cases, the battery status indicator reports a full or partial charge, and the Apple System Profiler reports a normal battery connection and capacity. We previously noted a bevy of fixes for this issue, including resetting the PMU, disconnecting external devices, resetting PRAM and more. However, we found that waiting for three or more startup chimes while resetting PRAM resolved this issue where waiting for only two chimes did not. Resetting the PMU requires the following steps:. How to watch the Galaxy S10 launch: Enter Terminal and type:.

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Read our privacy policy. Restart in Recovery mode hold? Enter Terminal and type: Restart Enter Terminal and type: BAK Crashing is now solved. Please my Amperage mA: S very often instead it won't shut down, what about that? Scroll down for the next article. MacBook Running Slow on Battery? Here Are 3 Ways to Fix It. MacBook Trackpad Not Working? MacBook Battery Replacement: MacBook vs. Pro vs. Air Comparison.