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G4 firm ware problem

It say type in "mac-boot" but it doest take me back to my computer

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  • Krabby May 11, 2010

    It can be a couple of things, it can be firmware or a hard drive problem do you have anymore info.


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  • 233 Answers

Take the battery out for an hour. Zap the PRAM about ten times and see if it starts. If not try booting from the OS CD holding down the "C" key at startup. If it still won't start try a different hard drive and test the memory. Try a different CD ROM drive. That is all I can think of right now.

Posted on Dec 30, 2008

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Posted on Jan 02, 2017

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1 Answer

Error code 4mem/63/40000000:0xb6478798

Hi Dudley
You may not believe this, but... the only people who have access to the "error codes" are the Apple in house engineers. In all the years I have been fixing Mac's I have never needed to traced an Error Code. Even when you know what it means, it won't help.
The best action with a computer fault is to determine whether it's a hardware or software at fault.
The way to do that on a Mac is to start by booting up the computer from another clean MacOSX.
There is a very simple spare system loaded on your Mac already.
So... try that first.
Reboot your Mac. As soon as you hear the startup chimes, hold the option key down until you see some icons.
Choose the "Recovery" icon to boot from.
This will startup the machine with only a basic OS X.
Now... does you problem still exist?
If it's OK then the problem is probably a damaged OS X software.
You can also try and Re Boot while holding the "Shift" key down. This will disable many extensions and may fix some issues, but it really slows the machine down while in that mode.
Then try re Booting as Normal and check for the problem.
If you find that your OS X is wounded then I would suggest that you get a free (trial) copy of CCC and Get yourself an external hard drive NewerTech 1 0TB Hard Drive Voyager in stock at OWC (1TB partitioned into 2)
I use the dock & drive above because it is so versatile for a technician as you can plug in the drive of your choice. Eg 1 for movies, 1 for Backups etc. I also prefer 3.5" drives as they are faster and more reliable than the 2.5 inch drives.
The choice of supplier & size is totally yours ....... I don't get any kickbacks from any suppliers. (I'm Down Under in Oz)
Download from Apple the Yosemite OSX10.10.3
Apple Mac OS Mavericks
and copy this to one of the empty partitions. You could use a 32GB memory stick formatted for Mac (Disk Utility) and practice installing the new OSX on to it, to get the feel as to how it installs.
Use CCC to make a clone to one partition on your external hard drive. When completed, you should boot from this clone to prove that you have an exact bootable copy of your faulty drive.
Once this is done you are free to use "Disk Utility" to erase your internal Hard Drive & Install the new (Clean) OS X10.10.x onto the drive. When completed it will ask you if you want to "Migrate" your old files & settings back to your newly installed OSX (Yosemite)
Then you Mac should be as new again.
Or you can just use the new OSX10 as is but you will have to type all your details back in and set up your network etc.

Hope this Helps
If it does... Please Give me a Tick of Approval for all my typing!
It's often the only thanks we get...
Bootable Backups

Aug 07, 2015 | Mac Desktops

1 Answer

Can't log in with password

You can boot from the install CD/DVD that came with the Mac, there's a reset password tool there. Or if it's a new Mac, from the Recovery partition via Command + R when you restart.

You can also reset a forgotten Mac password without a Mac OS X installer CD/DVD or recovery partiton. This is basically the be-all-end-all approach if nothing else works, because it's guaranteed to get you back into a Mac when the other options are not available, and it works for all versions of OS X. The steps may seem a little intimidating but it's easy if you follow them exactly:

Stage 1) Boot into Single User Mode and remove a setup file
  • Restart the Mac holding down the Command+S keys, this will take you into Single User Mode and it's Terminal interface
  • You'll need to check the filesystem first, type the following command exactly, followed by the enter key:
  • fsck -fy
  • Next, you must mount the root drive as writeable so that changes will save, type the following command exactly, followed by the enter key:
  • mount -uw /
  • Now, type the following command exactly, followed by the enter key:
  • rm /var/db/.applesetupdone
  • After removing the applesetupdone file, you need to reboot, type 'reboot' and hit enter.
Stage 2) Create a New User Account upon System Boot
The hard part is now over, no more command line. In this step we just create a new user account as if you just got a new Mac:
  • Upon reboot, you will be presented with the traditional "Welcome Wizard" startup screen just like when you first get a Mac
  • Follow the welcome wizard and create a new user account - making the account name different from the account whose password you want to recover, make this new user account is an Administrator
  • Continue on and boot into Mac OS X with this newly created user account
Stage 3) Reset the Forgot Password via System Preferences
Now you just need to reset the forgotten user account password using the Accounts control panel:
  • Once you are booted into Mac OS X, click on the Apple logo and then navigate down to "System Preferences"
  • Click on the "Accounts" icon in System Preferences
  • Click on the Lock icon in the lower left corner of the "Accounts" preference window and enter the newly created user credentials, this enables you to change other user accounts and reset other users passwords
  • On the left side user panel, select the user account containing the forgotten password
  • With the user of the forgotten password account selected, click on the "Reset Password" button
  • Enter a new password for that user, be sure to include a meaningful hint so you don't forget it again!
  • Close System Preferences and reboot the Mac
  • You can now login to the previously inaccessible user account using the newly reset password! All user files and settings are maintained as before the password was forgotten
Now you can delete the temporary account you created to reset the users password. This is probably wise for security purposes.

Thanks, John

Mar 02, 2015 | Mac Desktops

2 Answers

Forget my password

Boot from the Apple supplied install media (CD, USB Flash, or recovery partition). You can select a different boot device by holding down the option key at boot time. Once you are booted in to the instal media, select utilities from the menu bar. There will be an option to reset password there.

Oct 16, 2012 | Apple Macbook Mac Desktops

1 Answer

G4 power light flashes

Thank for contacting Fixya, I will be glad to assist you.

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.

• 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 startup sound for the third time.

• Release the keys and allow the Mac to start up.

If neither of these processes do not work, have your RAM memory checked, as this could be a factor in your G4 not booting up.

One other factor to consider, especially given consideration of the flashing light and no boot up, depending on the type of G4 mac you have, would be the power supply, which is what gives your G4 the power to boot up and function.

Hope this helps.


-The MacTechTrainer

Jul 10, 2012 | Mac Desktops

1 Answer

When I turn on the computer it takes a while to boot up, and when it does it stays idle for 10 seconds or so then shuts off?

Sounds like there may be a problem with your OS X.
You will need to boot from your OS X DVD and run your Disk Utility to do a repair on your operating system.
To do this, start your iMac and pop in your DVD. Once you hear the boot up sound, hold the Option/Alt key. You will be given the option to choose between your hard drive boot up and DVD boot up, so choose the DVD. It'll take a while longer to load than usual as you're booting from a DVD, but once your Mac has booted up, use Spotlight (Apple + Space, type "Disk Utility") to load up your Disk Utility program. Once you've got that open, select your hard drive on the left and click "Repair Disk Permissions" and then click "Repair Disk."
Once you're done, reboot and your Mac should be working good as new.

Mar 25, 2011 | Apple iMac Desktop

1 Answer

I got this imac desktop computer model # m6498 from my aunt. when i turn it on it shows a spinning loading wheel and i cant get pass that page...How do I fix this?

Luck you, hopefully we can get this fixed! Ok, there are a few things that might be causing this, and several ways of dealing with them.
Firstly, if you're not fussed about saving the data already on the computer, try the following:
  1. Turn the Mac on and insert the restoration disk that came with it (If you don't have one then you'll need to get one, try ebay or amazon, or an Apple store).
  2. Turn the Mac off with the disk still in
  3. Re-boot it, holding down the C key. This will boot up from the CD, and hopefully you'll be able to re-install Mac OS X, which will give you a working, clean machine.
If that doesn't work for any reason, I'll need some more information. Try this:
  1. Turn the Mac off, after ejecting any CDs.
  2. Boot up your Mac, and as soon as you press the power switch, hold down Command and V. This boots up in verbose mode, giving you more information about what's happening in the computer.
  3. Watch the instructions on the screen, and see if there are any obvious error codes, or if there are any instructions that the computer gets 'stuck' on.
If there are any error codes or sticky instructions, please post them back up here and I'll see if I can help some more.
Hope that was helpful, good luck!

Nov 05, 2010 | Mac Desktops

1 Answer

When you turn the comuter on, it just shows the


I am going to have you take your Mac into Safe Mode to see if we can't remove a possible folder(s) that may be affecting your Mac's start up function.

Try these steps:

• Reboot your Mac
• Upon restarting your Mac, press the Shift key.
• Hold the Shift key until you see a White Screen with Gray Apple icon and eventually a spinning gear.

• When you see the Spinning gear, release the Shift key.

• Allow the Mac to continue booting up. Also this may take a little while
(NOTE: this may take anywhere from 5 to 15 minutes to load to the Safe mode screen depending on the performance of your Mac, but if it exceeds this time, shutdown your Mac and try just once more. It may have just frozen up the first time around for you.)

• You are going to enter the Safe Mode (which looks like your main desktop environment - the only difference is certain start up items are disabled.)

• Once within the Desktop in Safe Mode
• From the Finder Menu, click Go> Go to Folder
• Type in this line: /System/Library/StartupItems
• This path, is going to take you to the System Library folder which has all of your Mac OS X StartupItems.

• Remove all of those folders to the Trash.

*Reboot your Mac normally and see if you can access your normal User desktop environment.

This should help get your iMac G4 back up
and running.



Jan 30, 2010 | Apple iMac G4 Desktop

2 Answers

My macmini will not accept any discs, cd or dvd, administrator password works on log in but is not accepted while trying to install any programs or software from jumpdrive, networked, etc... help all...

Don't know much about mac's but anyway, in windows you can restore the pc back to a previous state, say last week or something. Maybe you can do spmething simliar with the mac

Oct 20, 2009 | Apple Mac Mini Desktop

1 Answer

''imac g4 does not see dvd drive after Xferring files and setting

when booting in os x after the first boot chime immediately hold down keys <apple,option,o,f> all at the same time and allow computer to boot to open firmware once there type "reset-nvram" exactly like that but without quotation marks and press enter once it returns to command prompt type "reset-all"and press enter (you must have the "-" in between the commands) the computer should restart if not when the command prompt returns type "reboot" and hit enter ..... also you can check the drive status by going to "system profiler" in apple drop down menu--->about this mac-->more info or applications folder-->utilities folder--->system profiler then selct disk burning under hardware in the list on the left

Mar 18, 2009 | Apple iMac G4 Desktop

1 Answer

Booting up computer

try to upgrade ram modules.

or make back up and format then install a new mac os!!

Jan 30, 2009 | Apple iMac 24" Desktop

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