IMac G4 Booting Problem

After 6 years of trouble-free service, my iMac (17" G4, 1.25 Ghz) won't boot past the gray screen with the apple and the spinning ball. It was running on 10.5.8. I've tried everything I could find in the Apple troubleshooting articles, including resetting the PRAM and PMU and booting in safe mode. I was able to access the hard drive from my MacBook Pro via target disk mode. I ran the disc utility program, and the hard drive is apparently in working order. I would like to try to boot from the Leopard disk or the original Panther disk, but I can't get the disc tray to open. When I try to boot with "c" (or shift) held down, I just get a loud beep before the computer proceeds to the gray screen and spinning wheel, where it remains indefinitely. What does this mean? What else can I try?

To get the tray to open, try holding down the mouse button at initial startup.
If you have not already, you can try starting up with the Option key held down. This will give you Startup Manager. If the internal drive volume is listed as a valid choice, select it and try to continue. See if that method works any better.
If you are not able to start up that way or in Safe Mode, it sounds like a key system component became corrupted. Fortunately, it also seems like the drive is still accessible, so it is probably not a hardware problem. I would use FireWire target disk mode as you have already, and back up your personal user data. Then, startup from your Leopard installation disc, run Disk Utility from Installer's Utilities menu. In Disk Utility, select the internal drive in the sidebar (not the volume indented under the drive). Go to the Erase tab and erase (reformat) the internal drive; name the volume +Macintosh HD+ (if you want to use the standard name) and set the format to +Mac OS Extended (Journaled). Obviously, this will erase the volume.
After the erase completes (it should take less than one minute), quit Disk Utility to go back to Installer. Run a standard installation onto the internal drive.
NOTE: You said you had Leopard on it, so if you were using Time Machine, you can use the utility to restore the complete system from your Time Machine backup archive. Then, you will be back in business to within one hour of the failure time. Please post back if you need more details on how to do this with Time Machine.

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1st series iMac G5: Booting problems, kernel panics, waking from sleep...

Specifications of the iMac described: 1.8 Ghz, 1GB, 80GB, 64 Mb Nvidia VRAM, Airport, 10.5.5
Back in August 2004 my dad bought us kids an iMac G5 for ‘family use’. It had a fresh install of 10.3.5 on it and compared to the (1999) iMac G3 it replaced it was amazingly fast.
The iMac never showed any signs of probable issues, until we decided to upgrade to Leopard in January 2008. Initially, this upgrade was only meant to be able to sync with the latest iPod nano (who demanded a newer version of iTunes).
After the installation the first thing I noticed was a high CPU usage, the machine seemed slower than ever and that with 1 Gb of RAM (the minimum sys. req. for Leopard are 512 Mb of RAM). Anyway, then the real thing started, it wouldn’t turn on anymore. We brought it to an Authorized Apple Reseller, the Tech department said the Logic board had failed. The costs of the fix weren’t the worth the computer anymore, so...end of story. The iMac was indeed one of the bad series, although it hadn’t any swollen capacitors.
My dad already made up his mind and bought himself a Macbook. He then told me that if I was able to get the broken iMac fixed, I could keep it. And so, I bought an ‘as-is’ logic board on Ebay. Last weekend I installed it, and it actually seemed to work! Yet, the problems are during the startup: the first thing I see is a screen full with horizontal lines flickering all the time, like an old TV with bad signal. Mostly it won’t boot and I get the message to restart the computer (kernel panic, I got dozens of logs already!). Sometimes it got stuck during booting (grey apple screen with gear in the middle) making the fans go crazy (after a while) and sounding what others describe as a ‘jetliner taking off’ sound. Sometimes the screen remains black. Generally it takes me 5 to 10 minutes to start up properly. Maybe it’s just me but it seems like when the computer has warmed up a little (by turning on and off on and on) starting up gets smoother. I mean the startup screen suffers from less horizontal flickering lines.
During the use of Leopard, I again get high CPU usage, especially when I use multiple programs at the same time, or when starting multiple programs. My iStat Pro said once that the fans were running at 4700 rpm and the heat of the CPU was about 70 Celsius. If I really want to **** my iMac off I should play a racing game. That just totally freaks him out! These problems could probably be solved by adding more RAM. Right?
The iMac also has a sleep problem. Sometimes after lets say an hour or so, you can’t get it out of sleep mode (by manipulating keyboard and/or mouse, the sleep light stops, but the screen stays off --> only solution is to restart). What happened to me once was that it slept so long that it just got into a deep sleep by turning itself off completely!
Here’s a list of what I tried so far:
- Disk Utility: Resetting the permissions, no problems were found.
- Resetting the SMU, both on the logic board itself as by pressing the power button 5 - 8 seconds, no improvements.
- Resetting the PRAM, no improvements.
- Did the Hardware test of the original install CD, nothing was found, all good.
- Did Archive and Instal, this actually messed my system entirely, cause it wouldn't boot at all and when starting up from the Leopard installation DVD it wouldn't recognize the Macintosh HD.
- Did Archive and Instal with the original disks, this disk did recognize Macintosh HD and so I installed the original system, 10.3. Booting problems and those flickering lines are still there though.
Next phase will be erase and install, but first I want to know what you guys think about all this.
Oh eh, One more thing; The guys at Applecare (phone support) told me that the replaced logic board was also out of warranty and so they couldn’t help me. But as the man on the phone was kind, he told me to go look for a special ‘driver’ on the net. He said that the driver should be able to resolve some of the issues described. He said that I had to give in the name of the LB on google and look for results. Is this bogus? Because I haven’t found anything useful on google so far. What’s the name (rather than a number) of the LB in the first place?
I hope you guys can give me some answers. I'm kinda desperate. But I still feel there's hope...

The symptoms of a flakey power supply are sleep problems and you have done all the right things as far as resetting the SMU and PRAM. Your CPU usage can be tracked by going to Utilities>Activity Monitor - look and see what is hogging the memory. The flickering lines could also be an optical system going south.
The other thing you can do is run DiskWarrior or TechToolPro to see if you have corrupted directories. Preferential Treatment will let you check for corrupted preferences.

700mhz iMac G4 boot problem

Hi, I recently got this iMac from school in supposedly "broken" condition. When I got it it would not boot, displaying a grey screen only. Did the usuals, resetting PRAM and PMU. Also booted to apple diagnostic CD, ran an extensive test and they all passed. I have successfully booted it to an ancient ubuntu live CD as well.
I have stripped it down to clean out and remove loose change and other debris from the CD drive, whilst doing this I tested the CD-RW drive and Hard drive in another machine, they are both fine.
Now as the problem stands.... I installed Tiger (4 CD version), it worked fine, did software update and it hung (although the mouse still moved) while finishing the OSX combined update. I restarted it and it failed to boot, just sticking on the apple, no spinning icon or anything. I tried safe boot and single user booth but no keyboard commands did anything. Assuming I had mucked it up I installed Tiger again... reformatting the drive (journaled) and verifying it. Setup completed and I used tiger for a bit with no issues, ran software update, this time not selecting the OS X update, I let the two updates complete, one of them required restarting, I chose to shut it down. Once it had shut down I switched it on again and it hung on the Apple, no hard drive activity or anything. I reset the PRAM and this brings me to now, the spinning icon under the apple has appeared and it has been spinning for about half an hour now with no other activity.
Luckily I cloned the harddrive before running software updates after what happened last time.
I don't know why it's doing this though as it's done it twice now and obviously I can't be reinstalling or transferring the hard drive over whenever I want to restart it!
Any suggestions?
Thanks,
Ollie
Quick update... restarted it again and it spent another long while on the apple with spinning icon again and now it's changed to a light blue screen with same spinning icon.... still doesn't seem to be doing much though, it's been sat on this for ages. Much longer than I'd ever expect it to take to boot... even with that 700mhz processor lol.
Message was edited by: Olliez0r

The computer may also require more RAM to be
installed since Tiger requires more and better
quality RAM than the older OS X and 9.2 it had
back in the day when the computer was new.
The upper limit is only 1024MB of RAM. For
the correct specs and database info see the
http://mactracker.ca site for free download.
Good luck & happy computing!

IMac G3 boot problem

Hi! I just bought a old iMac from some guy on the internet. The computer WAS working when I went to buy it. I had a great price for it because of the dark display. It is a G3 600mhz graphite edition. I have another iMac, a G3 333mhz purple/pink. I had an idea wich was switching display betweens two computers. After trying some stupid things I realise it was a bad idea. Anyways, my problem is the "new" iMac was half open when I saw an external VGA plug in the back. So just before I keep unscrew the rest of the computer, I tried to use the VGA port. I plugged the computer, turned it on. I heared the chimes and I saw the screen showing "OS 9" and everyting. I plugged a VGA cable in the back and the computer turned off. I'm wondering if it's because I plugged a VGA cable in the back or if it's because when I did this I put weight on the top of the computer and I rested a little above. It happend at the same time. For now on, the computer never started back again. I can hear the chimes, the power button light turns on, a few sounds can be hear inside it for a few seconds like the hard drive and the cd slot but after 5 or 7 seconds, I can only hear the fan... I tryed to reset the power management (don't know if it's called like that) by pressing the very small grey dot just beside the ram. Useless. The keyboard doesn't seems to respond... HELP ME PLEASE!!!
I'm running OS 9, having 256mg of ram, 40gig of hard drive.
THANKS!!!

Hey Unwind,
The computer WAS working when I went to buy it.
What part was working?
I had a great price for it because of the dark display. It is a G3 600mhz graphite edition.
Nice machine but the monitor wasn't working?
I had an idea wich was switching display betweens two computers. After trying some stupid things I realise it was a bad idea.
What did you try?
I plugged the computer, turned it on. I heared the chimes and I saw the screen showing "OS 9" and everyting. I plugged a VGA cable in the back and the computer turned off.
So you tried to plug the VGA in hot?
Richard

Mid 2006 iMac Boot Problem (Since latest firmware update)

I have a Mid 2006 17" iMac. Ever since the latest firmware update in early December, about every other startup I've been having boot problems. After the white screen with the Apple Logo and the spinning wheel it goes to a blue screen like normal, but instead of the 'Loading Mac OS X' white window popping up it stays blue and the spinning loading wheel starts. I've left it loading for quite a while before and nothing changes. I have to do a force shut off by holding the power button. and then I start it up and it will boot normally.
Any help would be appreciated.
Thanks!

Actually, I think it'san early 2006.

Imac G4 20 inch 512 mb ram 1.25 ghz boot problem

i have a boot problem with my imac when i start it up it keeps on loading forever i have made a video so you can see the problem any suggestions on what the problem could be? http://www.youtube.com/watch?v=yh2jhTf0MHI

Hello, and welcome to Apple Support Discussions!
While I did look at the video you posted, nothing was clearly evident in there;
so you may have to see if it is possible to start the computer from an install
disc, with C key held down, and use Disk Utility in the Installer's menu.
You may be able to see if you can 'verify' the hard disk drive, and if so, it
may be possible to 'repair' the Macintosh HDD. Some kinds of errors may
not be repairable by Disk Utility's tool options; but you could secure erase
the entire hard disk drive, and reformat it, then install a new system if that
may be the only way to make the computer work again.
Though the internal hard disk drive, or other hardware may be behind the
failure to get past the gray start screen with busy wheel, etc.
You may be able to try & see if the computer could start up in SafeBoot
mode, this is usually achieved on a startup by holding the Shift key down
and keeping it held down until you see there is a hint that the OS may work
but I usually suggest to keep the Shift key held down until you see the Login
screen (in Tiger) or a preliminary window appears in Panther, with SafeBoot
in a dialog box. In SafeBoot you can read system Console Logs, to try and
detect a hint of what isn't working, in those reports.
In SafeBoot, if the computer gets that far, it would be running in a reduced
version of OS X and you could also check the computer to see if the
hard disk drive shows up as Verified or passes SMART, etc. You can also
run Disk Utility's 'repair disk permissions' in Safeboot. Generally, after any
use of SafeBoot, you'd restart the computer; or try to.
The computer probably could use more than 512MB of RAM; the total it
can use, is 2048MB or two 1GB chips; each is a different style chip. The
lower more easily accessed RAM slot can use on 200-pin PC2700/DDR333
laptop chip similar to that which the 'mid-2005' iBook G4 uses, by specs.
There is a chance the data on the hard disk drive may be corrupted enough
to not get past the startup point; if you can't get a rise out of the computer
with Disk Utility or SafeBoot, or other localized means, you may have to get
and try to use a version of Disk Warrior on bootable CD; one most likely to
be similar to whatever OS X version is running in the computer.
Also, the hard disk drive may be worn out or have a defect; so due to age
and wear, that may be on its way out. There are several reasons why the
computer may get stuck at that stage of startup. There also are articles you
can find in a search, by using words such as ' Mac OS X gray screen start'
and other different ones, provide other responses. Some can be helpful;
in that owners with similar issues have posted online dozens of times, and
some of them get similar replies. You can test a validity of any consensus.
Without knowing more about the status of the computer, its hardware or
software; its history and use, etc; a reply can only focus on a few items.
• Mac OS X: Gray screen appears during Startup: (10.4/10.5/10.6)
http://support.apple.com/kb/TS2570
• Your Mac won't start up in Mac OS X (Mac OS X 10.3.9 or earlier)
http://support.apple.com/kb/ts1411
Some suggestions include resetting PRAM/NVRAM, among others
Most topics are searchable, and some pages have links within them.
Good luck & happy computing!

IMac boot problems

Hi,
I have a iMac(iMac9,1) here which experiences some boot problems. If you try to boot "normally" it just sais "No bootable device". Keycode's don't work so I imagened that the firmware password was active. And indeed; holding the option key gets me to a password an after that a screen where I can choose where to boot from.
If I start from the harddisk, most of the time Mac OS X starts. But it takes a very long time and the performance after starting isn't that great either. I repaired the harddisk using the disk utility on the Mac OS X DVD and tried to delete the firmware password(so I could try to reset the NVRAM at startup). But it just doesn't reset, althought it should(I even couldn't change the password while starting from the DVD). That seemed very odd.
By the way; using the startup disk utility gets me nowhere either.
Also if I reinstalled Mac OS X, it would do fine until the very end, where I got an error. The installation works but with the same boot problems.
Since the "no bootable device"-problem seems to be a Windows problem, I tried to recreate a windows partition so I could after that delete it again. But opening the bootcamp assistent just gives me an error saying that I need to update my ROM-software, which I can't update because it has the newest version already.
Is there any way to just reset the EFI?(there is no firmware restoration disk for this mac)
I hope someone can help!
Regards,
Dennis

"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.
If that doesn't help Reinstall the OS.

The mother of all re-boot problems.

Hi All,
I've got that re-boot problem that seems very common but the solutions out there aren't working.
Basically the computer will turn on, chime, grey screen comes up, shortly after apple logo, and then the gear starts turning, about 2 minutes later restart, process repeats.
I've tried.
- Booting from CD/Recovery Disk - Won't happen
- A million different key combinations, I've read about 10 different posts on key combinations and tried them all, including PRAM reset, boot from different source, etc.
Basically it's like my keyboard commands aren't being heard at all, but to test if the keyboard was working I pressed the caps lock button and the light was going on and off which tells me its powered. The only kind of input I have been able to acheive is by holding the mouse button down to eject the CD, other than that I have absolutly no control what so ever.
Would like any insight.
Cheers,
Jarrod.

HI,
If you've had your iMac for less then one year then it's covered by the one year limited warranty.
Take it to an Apple store or an Apple certified repair provider.
Carolyn
Message was edited by: Carolyn Samit

Help with boot problems

I was trying to install XP last night on my imac with boot camp and ran into this problem.
The partition I would create in Boot Camp would never show when rebooting with the XP cd so I thought, Maybe its on the next screen of XP install.
I SELECTED the only partition it showed me and realized that was not the one and exited XP setup. Now It shows my Mac HD as "windows". Note: I did NOT format the drive, nor tell it to do anything... I think it only erased the boot record?
How can I restore the boot record of OS X or is there any way to get data off that drive before formatting/reinstalling OS X?
Any help would be appreciated!! Thanks guys!

More info that might help, still having the problem.
I had been following along on the Boot Camp Installation Guide, when I boot into Windows Setup, I was looking for the correct partition, all I see is one partition "C:Partition1 Unknown"....
I SELECTED it, and then I backed out of the Setup. I didn't format it.
I didn't see the <BOOTCAMP> partition in the list, and that's what I was looking for.
Now the OS X drive shows as "windows" and unable to boot into OS X.....

IMac wont boot up

My IMac wont boot up! I installed the Mac OSX system disk and ran disk utility this is the results:
invalid node structure
The volume Macintosh HD needs to be repaired.
Error: Filesystem verify or repair failed.
What do I do to get this up and running again, I would appreciate any help.
Thanks,
Joe

I called applecare and they were able to get my iMac up and running. Apparently there is an issue with updating software. I just had to do an update today and ended up with the same problem. So I re did what the applecare rep told me and I got it going again myself. I am hoping this will not continue. So anyway, I am going to provide the steps on how my I got iMac going.
1. unplug the computer for approx 17 seconds.
2. unplug everything from the computer except the mouse and keyboard.
3. plug in the computer
4. turn on the iMac and hold down the option key at the SAME TIME
5. when the iMac comes on, it will make a loud beep noise, CONTINUE to hold the power and option key until a small the Mac HD icon displays.
5. When the Mac HD icon shows on the screen, release the power button and option key. Then click on the arrow below the Mac HD icon.
5. The iMac will boot and take you to the desktop. Then click applications
6. choose the utility folder
7 then choose disk utility
8 a screen will appear that states first aid. At the bottom, there will be an option to repair disk. Click on that then choose Mac HD.
9 When this is finished, you are good to go. These steps will repair what ever the software updates are doing to the hard drive.
Hope this helps.

Imac wont boot

My late 2008 iMac wont boot. I have tried everything that i understand but cannot accesss harddisk.
I cannot boot fron dvd -cd or usb. I would like to run diskutil from terminal to repair and verify. System hangs/ stops running, when i try command+v ,message that (vmcl: Module initialized.)
Command + s puts me in single user mode and i cannot run diskutil.
Safe start is also not working.
I have all my work on imac and depserately need help.
Any ideas ???
Imac 2008 24" 3.06GHZ/2GB/500GB/SD8X/GF8800GS/512.
Downloaded and installed Lion recently, all software is ligitimate.
Running vmware / Vista, occasionally.
Machine just stopped, froze up.

Hei, just to let you know. I gave up and delivered my machine to mac repair. It turned out that a module error was the cause of my problems. They have since replaced the defective part and my machine works like a dream. No reinstalling either, all existing files and software are intact.

Frozen iMac with Network problems

I have a 21.5 inch iMac purchased around Nov'12. Three days ago, suddenly no web page could be opened. I thought it to be a problem of my router but when I found out that I was able to use the Internet perfectly from my MacBook, I restarted my iMac but the problem remained. I shut it down & then restarted it... Now it showed only a white screen with the Apple logo on it and the waiting symbol. This remained till hours until I got irritated and switched off the power supply. I switched on the next consecutive days but the problem persisted. Today fortunately my iMac started.. The home screen has come... It is able to recognise my wifi & Ethernet but does not open any web page. Going to system preferences and then to Networks is hanging the system preferences window. When I force quit it, it says to file a report to Apple.... But the problem doesn't get solved... I always believed Apple as a company whose products never hanged up or faced hardware or software issues!!!

Hello,
If 10.7.0 or later...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions, reboot.
If you still have problems, this has worked for a few...
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
10.4 instructions...
Is that Interface dragged to the top of Network>Show:>Network Port Configurations.
If using Wifi/Airport...
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
Click OK.

IMac not booting after putting HDD in windows machine

Hi, I'm helping a friend repair an iMac G5 ALS (before the iSight ones)
The main problem is that it keeps switching itself off, or just not turning on at all, but i have ordered a new power supply to fix that.
The other problem is that, before I did anything to the mac, I put the hard drive in to my Windows Vista machine to back up important files. But the drive didnt appear in My Computer. So, I right-clicked on My Computer, went to Manage and then the Disk Management service. From here I right-clicked on the Mac drive that had appeared on this menu and then clicked 'Initialize' (I had done this before on a Windows HDD so it seamed like the logical thing to do) but nothing happened. (I now know that it wasn't recognized by Windows because of the different filesystem on macs)
I put the HDD back in the mac and waited for it to start playing ball. Eventually it decided to turn on, but instead of booting, it came up with the flashing question mark folder. I put the Leopard disk I have into the machine and it booted to the Leopard installer.
Using the disk utility I found that the hard drive was there so I verified and repaired it and rebooted but still just the flashing question mark folder comes up.
I'm fairly certain that it was the 'Initializing' that caused all the boot problems.
Any ideas anyone? Cheers in advance.

Welcome to Discussions - you will have to reinitialize the hard drive as Mac OS Extended (journaled) before it can be recognized by the machine. Boot from the Leopard disc and after you have selected English as your language, go to Tools (or whatever it is called, I don't have it in front of me)in the menu bar and select Disk Utility and reformat the drive.

What is the technical 'cause' of the infamous iMac black screen problem?

Can anybody shed some light on what technical malfunction exactly causes the infamous iMac black screen problem? The common solution seems to be a logic board replacement. But what exactly is broken on the logic board? Is it the Geforce chip? Some kind of external driver circuitry? Or something completely different?

I was referring to the many problems also described in this thread (and also in many other places):
http://discussions.apple.com/thread.jspa?threadID=196774&tstart=0
In specific I am referring to machines where all of this applies:
- internal monitor stays black after power-on
- computer boots normally
- external display works normally
- internal display backlight works and can be adjusted in brightness, but all pixels are black
- PRAM reset doesn't help
- NVRAM reset doesn't help
- PMU reset doesn't help
- reinstalling OS / booting from CD doesn't help
- machines with this problem sent to repair come back with a replaced logic board
I'm looking for more information on the technical cause of the exact problem as stated above. So I can attempt to repair my iMac

Diskwarrior cd booting problem

Hi! This is my first post and i need help. My hard drive was giving me problems(freezing, etc), so I went out and bought Diskwarrior to repair it. Unfortunately, it would not boot from the disk no matter what I tried(held down c, tried the option key). So...I did what they said not to do and changed the startup disk to the diskwarior cd. I fixed the hard drive, but as you can expect, the computer now only boots on the diskwarrior cd, and i can't change that. I tried restarting and holding down the option key and the s key and even the control option o and f keys, with no results. Help me you folks are my only hope! How do I change my startup disk back to the hard drive?
Bruce L.

Hi Bruce and welcome to the discusions!
Did you try changing it back in the system
preferences? What happened if you did?
If not, boot your Mac from the CD, open up the sys
prefs and in there you will find the Startup Disk
option. Select the internal HD and you should be set.
Thanks for your reply Eric. Unfortunately, when the system boots up from the Diskwarrior cd, system preferences is not available. They do tell you that on their documentation, but I was so frustrated with not being able to boot from the cd, I did it anyway. If you know of anyway to stop the imac from booting from the cd once it is set to do so under system preferences, please let me know. Thanks for trying to help, I do appreciate it. Thanks again,
Bruce L.

IMac G4 Booting Problem

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