- Disconnect all external devices and cables, including USB, FireWire, and Ethernet.
- Reconnect these devices one at a time, beginning with the keyboard and then the mouse, and restart the computer after connecting each one to see if the computer starts up without stopping. If the computer stops responding after you connect a certain device or cable, you'll know that that's what's causing the issue. You should replace that device or cable.
- Find the Software Install or Restore disc that came with your computer. Insert the Software Install or Restore disc into your computer's optical drive. The disc may look something like the one below.
- Shut down your computer.
- Once it's off, hold down the C key on the keyboard and start up your computer. This will start up the computer from the Software Install and Restore disc instead of your hard disk.
- If your iMac G5 successfully starts up when started up from this disc, your hard disk may have damaged software. You can use the Archive and Install feature of the Mac OS X Installer to reinstall a good copy of the software. This kind of installation gives you a fresh version of Mac OS X, but you don't lose any data from the computer. All of your old information is archived.
- If you are unable to see the hard disk when you install Mac OS X, use Disk Utility to repair or reformat your hard drive. Important: Please be aware that formatting the drive erases all of the data on it. If you don't have a backup of the the data on the hard disk, you may want to have a company that provides data recovery services save the data for you before erasing it.
- If you are unable to reformat your drive or are unable to see the drive in Disk Utility, you may try to use a third-party disk repair utility to see if it can repair the disk.
- If you are unable to repair or reformat your hard disk, please schedule a service appointment with either an Apple Retail Store or an Apple Authorized Service Provider. If you don't have a backup of the the data on the hard disk, you may want to have a company that provides data recovery services save the data for you before ordering a replacement hard disk.
- After replacing your hard drive, if you are still unable to mount (see) your hard disk using Disk Utility, you may need to replace the midplane assembly.
iMac G5: My computer stops responding during startup
Several things could make your iMac G5 stop responding as it starts up. Some of the solutions involve reinstalling software on the hard disk or replacing hardware components. Follow the steps below to get your iMac G5 working again.
This article has been archived and is no longer updated by Apple.