Question about Apple iMac 24" Desktop

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Computer freezes or crashes

My mac has been working fine until few days ago; every time it goes to sleeping mode It crashes and i have to start again. Also lately while browsing Internet it crashes very often.

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Sounds like you may have some sort of Hardware problem. Possibly the Hard Drive may be bad. Go to Disk Utility in Applications >> Utilities >> Disk Utility  Select your HD in top LH corner of Disk Utility then click Verify Disk 
OS X very seldom crashes or freezes unless it has some sort of Hardware issue.

Posted on Jun 06, 2008

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1 Answer

Reiniciar el equipo


Normal restart: select restart from the apple menu, or press the power key (the sleep/restart/shutdown dialog appears), then click the restart button or press the "r" key.
Forced restart (use only if the computer crashes or freezes): Press simultaneously the Apple, Control and power keys.
Forced shutdown (use only if the computer won't respond to anything, not even a forced restart): Press and hold the power button on the computer until the computer shuts off.

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My mac computer keeps putting itself to sleep


It may be that the computer is overheating. Are you using the computer on a bed or other soft surface that might be preventing the computer from cooling properly?

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My Imac crashes. 10.6.4, 2 GB ram, 2 GHz core duo. I've started with a clean install and disabled (one by one) all start up apps. Out of the clear blue, the screen will go black & I have to turn it...


When you say "screen goes black," does the computer power down, or is it still operating? Does the sleep light come on? Does it respond to the keyboard and mouse? (Example: press the power button momentarily, wait a few seconds for the "Do you really want to shut down" message to appear, even though you can't see it, then hit the return key to answer "OK," and see if it shuts down.) Does the screen go black or come out of black if you tap the computer?
While your computer is working, go to System Preferences / Desktop & Screen Saver, the Screen Saver tab, click Hot Corners, and set a corner of your screen to Put Display to Sleep. Then next time your screen goes black, mouse your way into that corner, pause a few seconds, then mouse back out and see if your screen returns.

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1 Answer

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Considering you have tried the Safe Boot mode to correct this, try to resolve this from the hardware side:

Procedure #1:

Here are some steps you can try to resolve the issue:

• First, hold in your power button for approximately 10 seconds to do a hard shutdown, if you have not already turned your Mac off.

• Once your Mac is shutdown, you will need to perform what is called a PRAM reset (Parameter RAM)

• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously .

• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.

• Now, hold the keys down until the computer restarts and you hear the star tup sound for the third time.

• Release the keys and allow the Macbook to start up.
If the iMac still does not start up to your Desktop correctly, go on to the next procedure:
----------------------------------------------------------------------
Procedure # 2

-PMU RESET-

The Power Manager is an integrated circuit (computer chip) that is usually on the logic board of your Mac computer.

It is responsible for power management of the computer. It controls backlighting, hard disk spin down, sleep and wake, some charging aspects, trackpad control, and some input/output as it relates to the computer sleeping.

• If the computer is on, turn it off.
• Disconnect all the connections going into the Mac except for the Power cord.
• Once all connections have been disconnected, remove the power cord from the iMac.
• Wait 1 minute.
• Reconnect the keyboard, mouse and power cord back into the computer.
• Press the Power button to restart the iMac computer.

• Observe if it starts up to the main desktop this time.
If it does not however, you may have an issue with your current Mac OS X directory or the issue could be hardware related.
-----------------------------------------------------------------------
Here is a comprehensive reference for you regarding Additional Troubleshooting for Blue, Gray screen issues and more, that you can also review:
Apple Support Link:
Startup Issues for Macs
----------------------------------------------------------------------
If all else fails, you may need to visit your local Apple retail store Genius bar or local Apple-authorized service center in order to have your iMac at least diagnosed to find out what the core issue is.

Regards,

-Mactechtrainer


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1 Answer

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I would write down any error messages, and beep codes, and then look them up online for a place to start.

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2 Answers

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It depends on how long computer is being used in a day.
for general use
you can shutdown your computer once in 2 days but i highly recommend not to put in sleep mode and betting putting in hibernate mode instead of sleep mode.
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Good luck,

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2 Answers

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1 Answer

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