Powerbook G4 Gray Screen on boot up after trying to install an update

I was trying to update my computer but when I was doing the install and shut down all my programs to complete the install it said it could not find the application from which it was trying to update. I closed the update and when I tried to get on the internet and the laptop froze. I turned off the laptop and when I turned it back on all I have is a gray screen. I have done a PMU reset as well as a RAM reset. Both of these have not solved the problem. I know it is probably software related. Would you reccommend booting from the OS X disc??? Please help!!

I believe your problem is software related not hardware. Try to do archieve install and install update by downloading 10.4.7 PPC combo from apple site and then do the rest of the update from software update.
I think this problem caused of the bug in the 10.4.7 the first released by apple has problem with software update app (I've seen few of our customer has to do archive install to solve their boot related problem after software update to 10.4.7). Apple already released the update and also they fix the bug so I believe it is already safe to do archive install and update your software to 10.4.7 from software update but just want to be safe do from combo update download.
Hope this help
Flippo

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Forzen gray screen at boot

I'm using an iMac that was new in Dec '12. 27-inch I think it's still the current model.
Lately I've been getting long if not terminal hang-ups at boot on the plain gray screen.
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What program should I be using to do this with?
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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.a. Boot into Recovery by holding down the key combination command-R at the startup chime, or from a local Time Machine backup volume (option key at startup.) Release the keys when you see a gray screen with a spinning dial. When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
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 by holding down the key combination command-T at the startup chime. Connect the two Macs with a FireWire or Thunderbolt cable. The internal drive of the machine running in target mode will mount as an external drive on the other machine. 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.)
If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
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
Boot into Recovery again. When the OS X Utilities screen appears, follow the prompts to 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.
Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with proxy servers, or with networks that require a certificate for authentication.
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.

Does anyone know what a gray screen on boot up means?

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Is the Power light flashing? that may mean a RAM problem.
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iPhone 4s will not boot after trying to install ios7 beta 4. Stops at apple logo with progress line under it. how can I reset it or get it back up to do a restore then try the iOS 7 beta 4 install again. Issue was probably caused by disconnection

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This doesn't sound good at all . . .
Did the Apple store test your power supply? It would be good
to know that the basic hardware functions properly.
And did you try booting from your Tiger install DVD? Assuming
you can get this far, run Disk Utility from the DVD and check the
disk - if it finds bad stuff on your disk, and can't fix it, you
probably do have a corrupted disk. The only solution may be to
reformat the disk - hope you had a backup copy . . .
A big guess on my part is this happened when you hit Cancel on
the install.
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start over . . . :^(
Good luck . . .

Powerbook G4 Gray Screen on boot up after trying to install an update

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