My G4 AGP won't startup after turning on firewire target disk mode

Can any one help me on this? I have a G4 AGP Graphics Mac running 10.4.11.
I turned on firewire target disk mode in the startup utilities to transfer files to my G5. The G4 started up in Firewire just fine and I could open it up as a drive on my G5, but the problem now is that the G4 won't startup in anything but firewire mode.
So my question is: How do you shut off the firewire target disk mode? I have tried all the keyboard commands at startup and inserted the Tiger install disk and holding the C key, but nothing will let me get me passed the Firewire Icon at startup.
Any help would be appeciated, Thanks.

Hi Steve, and a warm welcome to the forums!
More things to try...
Does it boot into Open Firmware with CMDOption+of ?
http://docs.info.apple.com/article.html?artnum=42642
reset-nvram (press Enter)
set-defaults (press Enter)
reset-all (press Enter)
Have you done a PRAM reset...
http://docs.info.apple.com/article.html?artnum=2238
Tried resetting the PMU?
http://docs.info.apple.com/article.html?artnum=14449

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Hi,
Well it started like this: suddenly a dark grey veil lowered across the screen with a notice in several languages saying "you must restart your mac" (or something to that effect). I panicked and pressed the power button, the mac shut down.
I started it again but it only got as far as the grey Apple screen and then sat there for a while until the fans started ramping up in the famous jet engine style. I shut it down again.
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Cheers,
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Hi Cliff, and a warm welcome to the forums!
See if any of this gives us more clues....
How to reset the SMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...
http://support.apple.com/kb/HT1436
Earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939
PM G5 won't start...
http://support.apple.com/kb/HT2173

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Hi Matt-
No chime is significant.....
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Hi,
We have some new Intel iMacs and have transferred some information from our previous G4 PM (one MDD and one Quicksilver) to the new iMacs. For some reason the G4's will now not boot up and kernal panic on the gray Apple boot screen. This has happened to all the G4's we have in our office. They are running OSX 10.2.8 and the iMacs are running OSX 10.4.4. We can still mount the drives from the G4's using FireWire Target Disk mode.
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Running 10.5.8
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ATI 9800 Pro Video Card
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alternately using each boot drive while the other is disconnected
removing RAM
removing the SATA controller card
checked all connections
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MacUser,
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Boot into Open Firmware by holding down the 'Command-Option-O-F' keys from a cold start while the chime is being played. You will see a command-line screen...enter these commands:
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2. Press Return.
3. At the Open Firmware prompt, type: reset-all
4. Press Return.
Example:
0 > reset-nvram
Press Return
0 > reset-all
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Macbook Pro won't mount during target disk mode

I don't know what to do.
I was using Safari today when the whole computer froze. Nothing was responding, so I had to force shut down.
When I went to restart, I got a gray screen with the apple logo and a progress bar; the bar will take a while to fill, then the computer shut down completely. Happens every time now.
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Partitioned fresh hard drive into 2 partitions: 1 for OS clone, 1 for data recovery
Used Carbon Copy Cloner (an excellent tool) to clone working OS to 1st partition
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Held Option on malfunctioning MBA and booted to cloned drive
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Used Disk Util from booted clone to format MBA internal drive.
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I have a iMac (2011, Mac OS X 10.7.4) with the dvd of Mac OS X Leopard (10.5) in it, that is in firewire target disk mode.
This one is connected to a iMac G4 Flat Panel (1ghz, 1,25 SDRAM, Mac OS X 10.4.11) to install leopard on it.
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I know Apple added 128+ GB support to the ATA bus halfway through a model, but if this is the older version, why does it report the higher number in some placess?
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Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.
There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.
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b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Step 3
Boot in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is damaged and the drive is probably malfunctioning. In that case, go to step 5.
If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then reboot as usual (i.e., not in safe mode.)
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Step 4
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 5
Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual.
Step 6
Reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 7
Repeat step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a backup.
Step 8
A dead logic-board battery in a Mac Pro can cause a gray screen at boot. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions.
Step 9
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested.

TS3243 My Desktop Mac won't startup, it turns on to the grey screen flashing question file. I have been able to startup from the snow leopard install cd but once I try to repair within DU the disk never appears in the side panel. The only thing there is "

My Desktop Mac won't startup, it turns on to the grey screen flashing question file. I have been able to startup from the snow leopard install cd but once I try to repair within DU the disk never appears in the side panel. The only thing there is "Media"... What can I do? Help!

If Disk Utility cannot see your drive it doesn't look good.
You could try DiskWarrior. It is expensive but can often fix directory structures where DU cannot.
Replacing the drive is also a strong likelihood. If you don't have a fairly recent backup, then it might be worth buying DiskWarrior
additonal notes;
Gray screen appears during startup

Mac won't startup after Target Disk Mode

Hello all, i recently purchased a G5 Imac and attempted the Target Disk Mode for transferring files from my old G4 PowerPC Quicksilver. It took a very long time to get the disk to mount itself during this process but when it was there i did all my transfers and when done, ejected the disk. Without the firewire attached i have now restarted the PowerPC model and was stuck on the blue screen of death after the usual startup. After doing some CMD+V, CMD+S, CMDOPT+OF, CMDOPT+PR i have now been apparently made it even worse because now it just sits on the gray screen with the Apple. I can't seem to find my original discs for the PowerPC but have the new ones that came with the G5 readily available but doubt they work due to the intel differences but i could be wrong....any help folks? Thank you kindly in advance

i've changed out the battery to no avail. I have always had a secondary HD in my case and i was able to find my disks that originally came with my mac and installed a fresh version of the OS on the secondary. Everything seems to work fine there except now i'm running on a system 7 years old and the auto-updates aren't giving me any options to move closer to today's technology. as far as my main HD, i believe it is dead and that is the problem from the get go so i assume that i'm screwed there and will have to start fresh with this secondary HD now my main.

Startup problem after use in target disk mode with a PC. Ideas?

I used my Mac 10.4 in traget disk mode. Data transfers between Mac and PC worked fine (via Macdrive 6). After disconnecting and trying to boot normally, Mac doesn't recognize internal volume. It flashes the question mark.
Tried to repair disk via install DVD - disk utility found no problems.
Reapired permissons.
Reset PRAM and NVRAM.
Tried Startup utility - found the internal volume and even after selecting it for startup, I still get the flashing question mark.
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Archive and reinstall is not allowed.
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Powerbook G4 Mac OS X (10.4.8)

Hello,
You need to put the Tiger Install Disc in the 2011 iMac, boot the 2011 uMac into Target mode...
http://support.apple.com/kb/HT1661
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Hello Mac Gods,
I have an iMac, and it was running great until I started it up in target disk mode to transfer info to my new laptop. Now it won't start up, and when I started it up from the install DVD to repair the disk, the hard drive didn't appear at all (and couldn't be repaired). Any advice? It seems like it must be the result of the target disk startup - the timing is too perfect and I didn't have any problems before.
Any input would be much appreciated.

Hopefully you have AppleCare. If so, call Apple to see if this if you are afflicted with the dreaded motherboard problem.
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My G4 AGP won't startup after turning on firewire target disk mode

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