For laptops that have removable batteries a dying Apple breed remove the battery and unplug the computer when troubleshooting. Sometimes plugging in the computer and letting it sit for minutes recharges the battery enough to permit booting. Listening to your computer may seem a bit metaphysical, but can provide helpful clues to startup problems. Sometimes a Mac will power on but the hard drive will squeal, whine very loudly or make ticking sounds.
This can indicate a failed or failing hard drive. Leaving a failing drive struggling too long can cause further damage. If you have a very old Mac with a non-spinning hard drive, more drastic measures may be required. A groaning or buzzing sound that revs up and down at low RPM and sounds like a wounded animal could be a fan undergoing a slow death. These components are inexpensive to replace.
This may be the logic board, bad RAM, the power manager, a video card, etc.. Bad RAM can be a common culprit — on newer Macs, a blinking sequence of lights at startup can indicate this condition. Repeat for each DIMM in succession until you find the culprit. Once the screen turns grey the hardware tests are complete, and the Mac looks for a boot volume. Software now dominates the startup process.
Fix OS X Yosemite always booting into Safe Mode | MacIssues
This can indicate a corrupt installation of Mac OS X or a failed or failing hard drive. Once the spinning gear appears the BSD kernel Darwin has assumed command and begins loading device drivers. Such are the workings of UNIX. What this means for us mortals is that when a Mac stalls at the Apple logo or the logo with a spinning gear, it probably has a corrupt Mac OS X installation. It may also be having trouble accessing an internal or external hardware component, but this is less-likely. DiskWarrior is also worth a shot this is by far my most used disk utility.
How to choose a startup disk on your Mac to boot from USB
A hang at a blue screen, at the login window, or at the image of your blank desktop often indicates a Problem with a User Account. Corrupt Fonts or bad Preference Files. Setting up a second, emergency admin account on your Mac is helpful for troubleshooting account problems. Safe Boot may help too, as that bypasses non-essential fonts and user startup items which you can then remove from your User Library folder.
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Presented in your native language, or something close. Mac crashes can take on all sorts of appearances — the Spinning Beach Ball being perhaps the most familiar — but Apple has succeeded in scaring the bejesus out of many users with this dialog. It is accompanied by the screen slowly darkening from top to bottom before a multilingual warning appears:. A kernel panic can happen at virtually any point in the boot process and may indicate a corrupt OS, an incompatible kernel extension, or a hardware problem.
Try a Safe Boot to disable non-Apple extensions. Intel Macs can also boot from a USB flash drive which contains a bootable disk image, this can be very handy in an emergency. You can also use a clone of your Mac hard drive to boot a cantankerous system. This not only allows you to check, fix or copy data off the primary boot drive but continue working immediately when you have disk problems.
Kacey — sounds like you have a bad hard drive.
To follow up, just heard from the repair shop. The cable is bad. Logic board is fine. Thanks for your guidance.
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You also may have a hairline fracture on the logic board or loose connector on cable. No problems until Sunday morning.
I was able to log in and clicked on Mail icon. It froze. I did a force quit. Same thing happened when I launched Safari. I was in for about a minute and then it froze. I let the logo and spin gear go for about 3 hours and nothing. I tried booting from the install DVD and no luck either. Took it to a third party repair store and he was able to mount my old drive externally and I was able to get in. Hopefully this will get figured out in a few months!
Yeah, I feel you. It's insane as to how much needs to be done just to get these things working. I don't understand how these computers, which are massively identical, can behave so differently from each other. Some people are able to simply plug in the GPU without any prior setup and have it just work. Others cannot get it to work no matter how many resources they go through or how much help they get. Forum Icons: Forum contains no unread posts Forum contains unread posts Mark all read.
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Is there an alternative to rEFInd I can use? Builds: 1.
How to Use OS X Boot Options to Troubleshoot Your Mac
July 16, am. July 18, pm. This post was modified 4 months ago. Prominent Member. July 20, am. July 21, pm. July 22, am. July 23, am. July 27, pm. July 28, am. I disabled SIP and turned off the secure boot options. Is there something else I'm missing? MacBook Pro 13" Install Windows 10 and you can hot-plug the eGPU. What was your install process for rEFInd? Once I install it, the only way I can get it to show on boot is if I enable spoofing. I have not used it on this year MBP. Glad to ear I'm not alone with this new macbook model. I installed Win10 via bootcamp, tried to hot-plug my eGPU but nothing happened.
I tested with the 2 TB3 ports located on the left I will keep trying to make this work Can anyone give me any clue of how to make this thing work? As theitsage told us I thought I'd be able to boot windows with the eGPU connected but couldn't I tested with the RX today, tomorrow will try updating the drivers and installing the vega Still haven't been able to boot into OS X or Windows via external drive.
The only fix is to reinstall OS X each time. Feels like it might be a rEFInd configuration problem but I haven't figured it out yet. I also though there was a problem with the TB3 ports because tried connecting the eGPU in different ports and not always worked I'm a bit lost with this setup It sounds like you're able to boot just fine though. Are you using rEFInd?