Then, when attempting to boot the Mac or pressing the start button, nothing happens. In this case, you can force the MacBook Pro to boot by following these steps:. Also it appears that the MacBook Pro will reduce its own clock speed in this situation, thereby reducing performance.
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The only way to stop the fans from running at full speed and to return the clock speed to regular performance is to install a new battery into the MacBook Pro. I experienced this scenario on an old MacBook Pro model after removing a swollen battery. Once the battery was removed you can press the power button but nothing happens.
However, the above method of disconnecting and reconnecting MagSafe while holding the Power button was successful in starting up the Mac — with fans running at full speed and at reduced clock speed however. Nonetheless, Snow Leopard still runs well! And indeed, this particular MacBook Pro has no physical battery installed as you can see the internals in this picture:. With some other internal component replacements, sometimes simply plugging in the MagSafe adapter and holding the power button for 10 seconds is enough to cause the MacBook Pro to start.
Sometimes simply plugging in the proper higher wattage power adapter will allow the MacBook Pro to boot.
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If for some reason the above method does not work, the original forum poster does state the following possible workaround involving moving a RAM module to a different slot if applicable :. In my case this juggling of the RAM module was not necessary to boot the MacBook Pro a model year without a battery, but that additional tidbit may be valid to you. This article is obviously aimed at older MacBook Pro hardware, but it may be relevant to other older MacBook models too, including similar model year , , , , , MacBook and MacBook Air, and perhaps even some newer MacBook Pro models too.
Long live the old Macs! Does this qualify for retro status yet? Probably not… give it a bit longer. Enjoy this tip? Subscribe to the OSXDaily newsletter to get more of our great Apple tips, tricks, and important news delivered to your inbox! Enter your email address below:. I have a Macbook Pro 5,1 Late Model without the battery installed, and it boots without the fans blaring. Yes, I have a lot of these Macs, and while they will work without a battery, they will be very very slow! Apple laptops boot just fine with no battery, I ran a 2.
How to Boot to Safe Mode in macOS - Make Tech Easier
Cool story, but it depends on the model. You probably had one where you could remove the battery without opening the case. Most of the Macs where you have to open the case to remove the battery do not run without the battery as described, or at least unless you hold the Power button for 10 seconds, then the fans run like a jet engine and the CPU underclocks performance. When your hard disk is full it can cause spinning beach ball problems. For a lot of us, this just means cleaning up two folders: your trash and your downloads folder:. In a lot of cases, doing the above two steps can free up enough space to continue working.
That said, you might still need to free up even more space. To make this process easy, we like Disk Inventory X.
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With Disk Inventory X, you can look at your hard drive and find the biggest space hogs quickly so you can delete them and move on. It takes a little time, but if you follow our guide you'll have your hard drive cleared out in no time. Of course, it might also be time to just upgrade the size of your hard drive. A few other oddball things can cause the spinning beach ball. If none of the above work, here are a few more resources that will help you troubleshoot the problem.
If you've ever experienced the black and grey kernel panic screen above, then you know how scary and completely unhelpful it is. When one application has a problem, you get the spinning beach ball mentioned in a previous section, but when multiple programs fail—or the operating system itself—you get a kernel panic. Thankfully, it's not usually as big of a problem as it seems. In most cases, a kernel panic will force you to reboot you computer.
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Let this happen, and if you load right back into OS X, continue working on your computer as usual. In a lot of cases, the issue resolves itself and you can move along. If not, or if it happens only when you use specific programs, it's time to figure out what's going on. Running Software Update can often fix kernel panic problems because more often than not, it's a software issue.
Click the Apple icon in the top left corner, and select "Software Update. If for some reason the kernel panic happens when you're starting up and you can't load OS X, then you'll need to try and start up in safe mode. Reboot the computer and hold down the Shift key until the Apple logo appears. After a little while, you'll load up safe mode, a stripped down version of OS X. Here, you can still run Software Update the same way as you usually would. It's also worth visiting the developer's web site to see if other people are having a problem with a recent update or release.
If it's one specific app that always causes the kernel panic, it's best to not use it until an update is issued. If no software needs updating and you can't get your computer to start without a kernel panic then it might be an issue with one of the programs you have loading up automatically on startup.
MacBook won’t boot up? Here’s how to fix the problem
That means its time to clear out your login items. While you're still in safe mode you can remove any apps that start automatically:. If the kernel panics keep happening and no specific app seems to cause it, you might have a bigger problem. Things start to get really tricky if you're getting kernel panics and you can't isolate the issue with any of the above methods, so here are a few guides we've found helpful for pinpointing the problem with more advanced measures. This one hit me recently on an iMac. Out of nowhere, the screen turned a crazed green and yellow, and then the computer shut down.
After several attempts to reboot and trying just about everything listed above it eventually refused to turn on. In my case, my graphics card was toast, and I had to get it replaced, but that's not always the problem. Here are a few things you can do to troubleshoot and figure out exactly why your video card or display is freaking out. This doesn't always do that much good, but it's the easiest thing to do and only takes a few seconds. Sometimes this can correct display issues, and if so, continue using your Mac as you did. This controls everything on your computer ranging from the power to the fans.
Every Mac has a slightly different process for doing this, so head to Apple's official SMC Reset page , find your model, and follow their instructions this usually involves unplugging the power cord on a desktop, or removing the battery on a laptop. Once you reset the SMC a lot of your setting are restored to factory defaults and your display problems may get solved. The next step to figure out what's going on with your graphics card or display is to boot into safe mode to see if the problems persist.
Power on your Mac and hold down the Shift key until you get past the Apple logo. This boots into a stripped down version of OS X.
Here, you can see if the display problems are persisting. This might be screen glitches, pixelated graphics, or large black squares everywhere. If they are, it's probably a hardware issue and you should move on to the next step.
1. Check If the Mac Has Power
If not, it's likely a software problem, and you have a few different options for troubleshooting:. If none of those work, it's time to run the Apple Hardware test to see if it's a hardware issue. A lesser known feature of Macs is the Apple Hardware Test. Like the name suggests, this is a way to test for hardware failures on your computer. It's not foolproof, but it might help you troubleshoot your issue moving forward. While a hardware failure is never fun, hopefully the Apple Hardware test will actually show it so you can get the faulty hardware replaced. If it is a hardware problem, you can check out iFixit's Mac Repair Guides to see if you can fix it yourself.