Question about Apple iMac G4 Desktop

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Will not boot after upgrade

Will not boot after downloaded upgrade of bios This is my first time with a Mac so all is new. How do I recover it from this state

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Re: Will not boot after upgrade

The MAC Firmware is in no way supperior to a PC BIOS. PC BIOSES have much more visability to the end user and more configurability. On Macs you often have to reset the PMU switch, NVRAM etc when you add new hardware or if the computer crashes. This is a common issue on Mac's. The PMU reset is a little grey/black button on the board. It varies from model to model where it is. Google PMU reset.

Other common issues are power supply problems, PMU batteries (your system may not work right if yours is supplying too low voltage or dead).

P.S. I'm 99% a PC guy and Macs have an issue it generally is 10 times harder to troubleshoot. Even taking it in to a "Mac Genius" is moot. In my experience the "Geniuses" are clueless like Bruce and generally lack any sense about computers.

Posted on Feb 17, 2008

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Re: Will not boot after upgrade

Back up everything, and do a complete re-instal of the system software.   I don't know if Mac's have any such thing as a BIOS.  They are a completely different, and better, animal.
Good luck.

Posted on Dec 06, 2007

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Re: Will not boot after upgrade

Suggest you do a clean reinstall from disk but remember to backup your data

Posted on Oct 17, 2007

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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

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How to Recover Data on Macintosh The Right Way

As a Mac user whatever you lost files from: accidental removal, formatting, system crash, virus attack, etc., DO not panic! Now, it is at least possible to recover your Mac files as long as you follow the right steps.

It is said that about 80% Mac users are used to deleting a file or emptied the Trash bin by mistake on their Mac computer or perform format option. Do you really think those files are really gone forever or are you looking urgently for a solution to recover and restore those important files, photos or documents that you need and which you've just deleted? So what should be the right things to do when you accidentally met this kind of problem?

Possible to Recover files from Mac machine in such case? YES, definitely. As matter of fact, when emptied Trash Mac, used Shift-Delete to get rid of the file, deleted it from within an application or used some other method of removing it that bypassed the bin, then it is still almost certainly recoverable. The file is still not really deleted. Although the space occupied by the file becomes available for re-use by other files, it doesn't get re-used straight away so the data it contained will stay on your hard drive for some time to come and may be recovered using software that knows what to look for.

First things first - If you have Mac machines purchased after November 2007 are installed with the Leopard operating system. One of the most important utilities of the Leopard is Time Machine. This complete backup tool can backup almost anything and everything on a Mac every hour with its unique features. Once you deleted or lost your critical files, just enter your Time Machine browser, you'll easily do Mac data rescue from Time Machine backup. If time machine has failed or you forget to set the backup, then you may need to use the third party Mac data recovery software to rescue data.

Data Recovery for Mac is a high-end Mac data recovery solution that recovers deleted or lost files (documents, videos, photos, archives, email and more) from HFS, HFS+, and NTFS, FAT file system volumes on Mac machines based on OS X. It can scan and find lost partitions, boot sectors and other file system components within internal Mac hard drive or external device. Incorporated with 3 Recovery Options like 'Deleted Recovery', 'Raw Recovery' and 'Lost Partition Recovery', the Mac file recovery software is a powerful yet comprehensive solution to recover all your Mac data in just a few mouth clicks.

But you should remember: before your deleted files are recovered from Mac, DO NOT attempt to put more files to the partition as this will decrease chances of Mac trash recovery for there might be a chance for your files to be overwritten. Overwritten, it is impossible to do mac data recovery. You should be aware of that.

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How to recover deleted or formatted data, files, photos and docs on Apple Mac...

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How to enter the mac mini BIOS

Macintosh Computers do not have BIOS, they use OpenFirmware.
You can get into OpenFirmware using this Key Sequence at startup: Apple - Option - O - F
Hold down all 4 keys and turn on your Mac, keep holding them down until you hear two chimes.
The OpenFirmware looks like this:
here are a few commands you can use in OpenFirmware
mac-boot (This will boot your computer using the default boot disk)eject cd (This will eject any CD or DVD that may be in the optical drive)shut-down (This will shutdown your computer)

Nov 05, 2011 | Apple MACMINI 266 2X2G 500 SD SYST EOL BUY...

1 Answer

I've inherited my brother's old Mac Mini (upgraded to Snow Leopard from Leopard) and I don't know his admin password. He doesn't remember it either, though, how can i reset it?

If you have the instal disc boot up the mac with it holding down the c key. Once it has booted up you can then go up to the menus and use the change password command. Then restart. Hope this helps.

Aug 30, 2010 | Apple Mac mini Desktop

1 Answer

I install and bootcamp and resize the disk to 160gb. then i accidentally put the cd in the USB external cd drive. i forgot to put it in the Imac g5 cdrom drive. when i boot up.. its a mess my mac os x not...

I understand your problem to be that at the time you were executing the critical reboot just prior to installing Windows with Boot Camp, you placed the Windows CD into the wrong optical drive. Now your machine is stuck at the gray screen and is not responding to anything and will not boot from the system DVD
I have encountered this problem previously. The solution is to boot from an external drive containing a valid copy of the Mac OS. Although your machine will not boot from a DVD at this point, it WILL boot from an external drive if you hold down the Option key after you hear the startup chime, and select that drive's icon when it appears. Once you have successfully booted, go to System Preferences / Startup Disk to select the Mac partition of your internal drive, and your machine will reboot normally.

This leaves only the question of how you obtain an external drive containing a valid of the Mac OS. Some options are 1) a cloned backup drive, 2) another Macintosh via "Target Disk Mode," or 3) have someone create you such a disk from another machine. On the plus side, this solution involves no loss of your data, which makes it worth pursuing.

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4 Answers


Since you are runing under Mac OS X, NO 1 choice is rely on Time Machine to recover from backup. If you do not set Time Machine, then you probably need a Mac data recovery software. But the first thing you need to take care is do not put more items to the Macintosh HD where those trashed stuff originally located. Learn more from this article recover emptied Trash Mac for more helpful information. Best regards.

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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

2 Answers

Deleted the mac off my mac!

Do you have the original install disks? You can start from there and reinstall and rebuld. It is still going to take some time. Insert the DVD and restart. Hold down the C key and follow the instructions to reinstall everything.

You might want to think about getting an external HD for TImeMachine in the future. If you have a TimeMachine backup Volume you could restore using the upgrade disk and your TimeMachine volume.

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1 Answer

Upgrading MAC G4's video

You can upgrade RAM & Video card in it, also download all the latest updates for everything. Then find the driver online for your particular video camera and download and install it. Then the MAC should pick up the camera and have the ability to to go that extra mile for you.

Jul 01, 2008 | Apple iMac G4 Desktop

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