Mac wont boot up blue screen

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.

Mac Startup and Software problems - Troubleshoot | Peter Bowey

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. 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. 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. 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.

How to diagnose a Mac that will not boot after updating

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.

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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.

How to Fix a Mac Not Booting Up (Part III): Recovering From a Crashed Hard Drive

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. 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.

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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. He said either the cable from the HDD to the logic board was bad or the logic board was bad. Does this sound accurate? If the logic board truly was bad, would I be able to do anything whether the drive was mounted interal or externally? It is a little over a year old and I do not have a valid warranty.

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  4. This issue happened after I shut off the computer by holding the start button due to safari having a rainbow pinwheel for a few minutes. Why is this happening so randomly? What is actually wrong and how much do you think it will cost to fix? Thanks so much Kacey. I suggest you take the laptop to an Apple Service Center. You can use the Get Info window in the Finder to give yourself access to your files from another admin account, or boot the iMac in Target Disk Mode and access from a second system.

    When I try to log in it goes to the page with Finder in the menu bar and then 2 or 3 seconds later goes straight back to the login page whether or not I click with the mouse or try using the keyboard. We tried changing the password but it makes no difference. My daughter is the administrator so we can log in as her and use the computer but I am unable to access the documents I have under my log in. Please can you advise how to correct this so I can log on or is there a way to access my documents through her account?

    I am not that computer literate but have tried searching through the Apple help menus to no avail. Kind Regards Karen. Mac repair guy said… oh you saw the kernel panic before the problem?

    I wasnt aware of what it was called. Now I find out tomorrow how serious the issue I have to pay for is. I still get a grey screen — no logo. One day, it decided not to even give me the POST chime. I said no thanks and went home. This time was no exception. I unplugged everything from the logic board except for the power supply and video connections and hit the power button. Sure enough, I got a chime.

    Began plugging things back in one at a time until I found the culprit. These hold boot and hardware configuration settings that might be interfering with the boot process, and resetting them to defaults might help. Allow the system to cycle through a few resets and then release the keys to allow it to boot normally. The procedure for resetting the SMC will be different for each system, and Apple has a knowledgebase article that outlines how to do this for various Mac models.

    Boot into verbose mode If the system still does not boot after a PRAM or SMC reset, try booting the system into verbose mode, which will output exactly what the system is doing at each stage in the boot process. To get to verbose mode, hold down the Command-V keys when starting up, and the system will show white text on a black screen that will say what the system is doing during boot. If the system pauses at any point, or shows any warnings, make a note of what the errors or other output is.

    It might be something that explicitly says a word like "Warning," or it may just freeze at a certain point when loading or configuring a component of the OS.

    blue screen is all I get

    If successful then you can likely dismiss any suspicion of hardware failure as a cause for the problem, and concentrate on the OS installation. Be sure you initially run a verification on the boot drive using Disk Utility available in the "Utilities" menu in the OS X installer since a fault with the volume format can prevent the system from booting. If there are errors then run a fix routine on the drive to try to correct them.

    If the errors cannot be fixed, you can try a more robust volume troubleshooting tool such as Disk Warrior, Drive Genius, or Tech Tool. If there are volume errors that cannot be fixed, then you likely will need to repartition and format the hard drive to make it usable again. Hopefully you have a full system backup that you can restore to the formatted drive, but if not, then one option is to purchase a new drive and install to that one. Then you can try recovering lost files from the faulty drive using an external drive enclosure and a good file recovery suite. Listen for hard-drive noise In addition to volume formatting and OS configuration, be sure to check the hard drive for any odd noises, especially regular and continual grinding and clicking or clunking noises.

    If the hard drive is failing then these noises are telltale signs of read problems. Have a fix? Post them below or e-mail us! We tested 5G speeds in 13 cities. Here's what we found : Faster speed versus more coverage. That's the most important issue for 5G networks today. We drowned AirPods, Powerbeats Pro and Galaxy Buds : We sprayed them, dunked them and even put them through the wash to find out which one of these three wireless earphones can handle the most water.