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Memory installation issues

I tried to install new memory, seemed to go smoothly.  Once I restarted the machine it beeped (toned) black screen, and the power light flashed.  I took new memory out and reinstalled old memory, same problem.

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That Happen to me till i found out it was faulty ram causing it to do this

Posted on Jul 17, 2008

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Take all the memory out, start up, hear the beeps.

shut off

Put the new memory back in, make sure its the right way and well in place, try staring up again.

Posted on Jul 14, 2008

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Google com

Apple has a variety of 'beeps' (sound) and 'blinks' (lights) for both computers and monitors. Your 3 beeps (wild guessing here) could be as noted in this link below ... which will also steer you in the right direction. Note too, that blinking lights - can have a pattern (3 blinks: short-short-long, for example). These also have specific diagnostic meanings and you might make a note before searching.

Link to some ref on blinks and beeps is here (a paste follows this note too):


Limnos Sep 26, 2012 9:00 AM
in response to Kort ' This helped me

For future reference:

Power-On Self-Test Beep Definition - Part 1 -

Power On Self-Test Beep Definition - Part 2 -

The power on self-test resides in the ROM of the computer. This test runs whenever the computer is turned on after being fully shut down (the power-on self-test does not run if the computer is only restarted).

If a fault is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below. If you experience one of these beeps, you may call your Apple Authorized Service Provider for additional troubleshooting assistance.

1 beep = no RAM installed
2 beeps = incompatible RAM types
3 beeps = no good banks
4 beeps = no good boot images in the boot ROM (and/or bad sys config block)
5 beeps = processor is not usable

In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.

You can also run Apple Hardware test from your original installer disc. Sometimes with RAM it is just easier to pull units and test them individually.

Aug 19, 2014 | Apple iMac Mac Desktops

1 Answer

How can 8 get rid of A pop up that froze safari on my Mac ?

If you don't have a second backup browser (like Firefox or Chrome), follow the steps below.

  1. Restart your Mac holding down the shift key... that boots it into Safe Mode.
  2. Once it's up and running, open Safari... chances are, you may have downloaded and installed software that installed browser re-direct software.
  3. Download Firefox (if you don't already have it) and install it. It won't be needed, but this is for future issues if the same issue happens again.
  4. Google "Adware Medic", download and install the software. This app is a virus-free AppleScript that looks for browser re-direct software on your system.
  5. Run the software and delete what it finds. You'll then be prompted to restart your computer.
  6. Once restarted, open Safari. You're issue should have been resolved.
I hope this info helps!

Aug 01, 2014 | Apple iMac Mac Desktops

1 Answer

IMac 24 core2duo 2.8 (A1225) early 2008. Got one without HDD. I put in a new 2.5 HDD and tried to fresh install OSX 10.8. Everytime after about 8 minutes in installation process the screen goes black and...

Now what did the Thermal Paste have to do with the swapping in a new Hdd. You've now added another variable to the equation before solving the first problem, getting it up and running. Grab another Mac and put the iMac in Target Disc mode, firewire the two, use the USB drive with 10.8 and install it on the iMac and see how that goes.

Nov 03, 2013 | Mac Desktops

1 Answer

Black screen and repeating chime

I assume you have already tried resetting the parameter memory and power manager (see Apple support pages or your user manual if you need information on these procedures).
This is not a display problem. It could be bad memory, a power issue, or a logic board failure.
If you are getting a tone (not a chime) every 5 seconds, the logic board thinks no memory is installed. If you get three tones, a pause, then a repeat of the three tones, you have a bad memory module. This is not necessarily a defective part; you may have a bad connection between the memory module and its socket. This will also cause system crashes if you do get the computer to start. I've seen computers running with an improperly seated memory module (one or both ends not latched down), and they'll produce symptoms like this. So, the first thing to do is check your memory module(s). If you don't find any of them are improperly seated, remove and reinstall them just to make sure. (Notes: if there is dust around the memory, gently blow it away before removing the modules. Do not touch the chips or flat sides of the module. Handle them only by the ends. Failure to observe this precaution may cause damage to the memory by electrostatic discharge from your fingers. If you have more than one memory module installed, remove one and try it again. If the system works, you've found the bad memory module. If not, put it back in and remove the other one to see if the system starts.
If you can't isolate it to a bad memory module or failed memory slot (problems occur when a module is installed in the bad slot, but not otherwise), and you are able to remove the back of the iMac, then you can inspect the power supply and logic board for failed electrolytic capacitors. This has been an industry-wide problem since the move to lead-free circuit boards - higher soldering temperatures and a requirement to reduce the toxicity of component materials lead to capacitors burning out internally and venting. Vented capacitors are usually easy to spot - the tops will be domed or split, and sometimes black or brown material will have oozed out of cracks in the aluminum top. credit:

Selection criteria for a new capacitor are: same capacitance (Greek letter mu and F, looks somewhat like uF), same or higher voltage rating, same or higher maximum temperature rating, highest available endurance at rated temperature, and highest available ripple current rating. A capacitor with too low a ripple current rating will probably burn out prematurely. Also, select for low ESR (Equivalent Series Resistance) or low impedance if you have two parts that are otherwise equivalent on the specs. Oh, and be sure you check the physical size - diameter and height in millimeters. It's embarrassing and costly to order a part, then find it won't fit the space on the circuit board, or it's too tall to put the cover back on over it. Replacing parts on a multi-layer logic circuit board is not a task for beginners. Power supplies are usually single layer and somewhat easier to work on.

If you don't see any bad capacitors, then try disconnecting both the hard drive and the optical drive. If one of these is the problem, your iMac will start with a single normal chime, then the screen will turn gray with a flashing question mark in the middle (it's asking, "Where's my startup disk?"). If it still doesn't act normal, then you probably have a bad logic board (I recommend measuring power supply voltages to verify those are good before buying a replacement board).

May 23, 2013 | Mac Desktops

1 Answer

Imac g4 freeze restart

This is a sign of memory issues with your Mac. Replacing the memory should not be very expensive.

Oct 10, 2012 | Apple iMac G4 Desktop

1 Answer

Password Issue

Usually after the installation of a system on a mac you will get the welcome screen coming up and you need to enter details such as name address email and your login details such as a user name and a password. If you can't remember the password or you did not fill in a password, all you have to do is boot up with your system disk (holding down the c key) when the instal screen comes up go up to the menus and find the one that says reset your password. You will not be asked for your current password so enter a new password and it will ask you to repeat the password. Once done restart. You will of course be asked for your password when you try and install software but this is a security protocol to stop unauthorised software from installing on your machine without your knowledge. Hope this helps.

Jun 07, 2012 | Apple Mac Desktops

1 Answer

My imac wont turn on!

It sounds like something is either corrupted on your system or one of the files in your imac may be suspect. What I would suggest is get your system disc boot the imac down holding down the c key on your keyboard. Once it is booted up go to the file menu and find the disk utility. Open up the disk utility and first of all repair your disk permissions and then run disk verify and if an error comes up choose to repair it.

If this does not work. I would suggest installing a clean system. Again with the system disk in your computer restart your machine with the c key held down on your keyboard. Choose to do an install but remember to select preserve users. This will give you a clean instal with your files and preferences intact.

Once your machine has restarted it is well worth setting a second account under system preferences under accounts as if one account becomes corrupt in the future you have a second account to fall back on.

For prevention of any problems in the future I would download Onyx from this website which also talks you through the method of using it. I use it every month just to keep my mac in tip top condition.

Hope this helps.

Apr 03, 2010 | Apple 24" iMac Desktop

1 Answer

Grey screen with a blinking folder and question mark

Two possible things are wrong either your hard drive has gone or your system has corrupted. Put your instal disk in start it up holding down the c key. Once it has started check that the hard drive exists by go to the menu bar and selecting the disk utility. If the hard drive shows it means that it is okay run the disk utility check drive and then run the repair permissions. Then try restarting, if it works then you are back up and running again. If the drive shows up and you restart and the same thing shows up with the grey screen, you will need to reinstal your system. You do this by starting up with the instal disk holding down the c key and run the instal script. To keep your hard drive contents your will need to use the preserve users instal.

If your hard drive does not show up the hard drive is probably a gonner and you will have to purchase a new hard drive and instal a fresh system.

Hope this helps

Mar 23, 2010 | Apple Power Mac G5 Desktop

2 Answers

Emac stalls on the OS X start-up

Start here...   Resolve startup issues and perform disk maintenance with Disk Utility and fsck  Mac OS X: How to start up in single-user or verbose mode  If that doesn't help, try booting into Safe Mode and see what happens, if it comes up hopefully another restart may solve, if not, you can at least use this as a starting point to try and resolve. Safe Mode will allow you to get around, surf, etc...   What is Safe Boot, Safe Mode?   Mac OS X: Starting up in Safe Mode
If Safe Mode comes up alright, I would install AppleJack, excellent troubleshooting article can be found here... Troubleshooting Tools: AppleJack  Another excellent free tool for performing maintenance is Onyx (be sure to download the right version for your system). Install the package, then run it, it will check your drive and the structure, after this, click on the automation tab and check on everything for Maintenance, Clear Cache, Cleaning, and check on Reset -> LaunchServices database and Mail's Envelope Index. When it completes, restart. Repeat any time something seems flaky, if not try to run at least once a month. 

Feb 01, 2009 | Apple eMac G4 Desktop

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