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My apple laptops login screen keeps going on and off on and off i cant login

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Try resetting the SMC
Before Resetting the SMC Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.

  1. Press Command + Option + Escape to force quit any application that is not responding.
  2. Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosing Sleep. Wake the computer after it has gone to sleep.
  3. Restart your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Restart.
  4. Shut down your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.
If your Mac appears to be running normally but isn't responding, force the computer to shut down by pressing and holding the power button for 10 seconds. Note: You will lose any unsaved work in any open applications.
For Mac portables experiencing issues related to the MagSafe power adapter and/or battery, try:
  1. Unplug the MagSafe power adapter from the Mac and the wall power socket for several seconds.
  2. Shutdown the Mac. Physically remove and re-insert the battery (if it's removable) and startup the Mac.
If the issue is still not resolved after following the troubleshooting items above, an SMC reset may be necessary.
After performing normal troubleshooting, these symptoms may indicate that an SMC reset may 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.
System Performance
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.

Posted on Oct 20, 2013


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Posted on Jan 02, 2017


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My 17 inch macbook pro would not boot up to the login page, so I reset the SMC and got the login window to come up. Now I've tried logging in with my correct password and it appears to be going to the...

This is a pretty unusual problem but it should be easy enough to fix. If you're getting the login screen after logging in and it keeps doing the same thing without any prompt from you, there's a problem with the login kernel of the OS itself.

I'd recommend booting to the install DVD (Mac OS X Install DVD) - do this by inserting it and restarting by holding down the 'C' key until you see the Apple logo and spinning gear.

After choosing your language, on the next screen go to the Utilities menu in the upper left, choose Disk Utility, choose 'Mac HD' on the left and click 'Repair Disk.' There will also be 'Repair Disk Permission,' IGNORE IT.

Ostensibly it should find and repair the problem. To restart, go to Mac OS X Installer > Quit Mac OS X Installer and choose restart.

If the problem persists, boot to the install DVD again and reinstall - it will not mess with any of your documents, movies, music, or other personal documents. Basically just keep hitting next/agree/continue until it says it is installing, which will take 30-45 minutes.

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This is called a boot loop.Try booting from the Mac OS X install disc. make sure you are plugin into the wall with the power adapter. insert the disc. press the power button while holding down the "C" on the keyboard
If it boots up normally you will have to reinstall the operating system
If it doesn't, you have a hardware issue. It could be the power adapter itself or power on the logic board.

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Cant get to login ...just keeps going back to the apple screen where your first turn it on acts like its going to go but just goes back

You may have a software conflict. Start your computer and immediately press the "shift" key. Hold it until your computer starts. If this works, something you recently installed is interfering with the start-up process. But if the computer still will not start, try this:

Insert the original system CD and restart computer, pressing the "c" key until it starts. This will force it to start using the operating system on the disc.
Once it has started:
1.Open the Applications" folder.
2. Open the "Utilities" folder.
3. Launch Disk Utility
4. Select "First Aid" from the bar in the upper middle of the window. Your selections should include: First Aid, Erase, RAID and Restore.
5. Select "Verify Disk" from the screen that appears. Make certain you select the computer's internal hard drive in the menu on the left of the Disk Utility screen. The software will examine your hard drive and correct any errors. This may take some time.

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Take RAM chips out and re-insert firmly. Make sure you got the max RAM chips in each bay and buy quality RAM chips made by Samsung or Crucial or OWC. Also, turn power on and immediately press option-apple logo which is right next to the option key-the letter P- and the letter R all at the same time. A bong noise will come from nowhere like your in a monastery. Keep holding down all the keys until you hear the 3rd bong and then you can let go. This resets the power manager. See if that don't help you any. Also, go into system prefs, select account, select your account on the left side, select login items, then click and highlight on each item, and then press the - button on the screen. Your not deleting these programs-just keeping them from booting when you power on. Sometimes these programs interfere with bootup.

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