Network Problems

Refer to this troubleshooting table if you are unable to switch to the Ethernet network option in the control panel or if you are unable to see any network devices. Note: if you are able to see most network devices, but one particular device does not show up in the Chooser, troubleshoot the device in question. You most likely do not have a network problem.

Possible Cause

Possible Fix

Wrong option selected in the Control Panel.

Open the Network control panel and select the Ethernet option. Are you able to select the Ethernet option? Yes: Verify that you can now see devices on the network. If the problem persists, go to the next step. No: Go to next step.

Corrupted PRAM.

Reset parameter RAM. Hold down Command >Option> <P> <R> during startup but before "Welcome to Macintosh" appears.

Corrupted system software.

Boot from the system CD that came with the unit. Open the Network control panel and switch to Ethernet. Are you able to switch to Ethernet and see Ethernet devices on the network now?

Yes: Reinstall system software. (You must use the system software CD that came with the unit to get the correct version of Mac OS.) If the problem persists, go to the next step. No: Go to next step.

Bad Ethernet cable.

Replace the Ethernet cable with a known-good cable.

Bad Ethernet port at the wall or hub.

Try connecting to a different Ethernet port at the wall or external hub. Are you able to switch to Ethernet and see Ethernet devices on the network now? Yes: The original Ethernet port is bad. Contact your network administrator. No: Go to next step.

The entire network is down.

Are other users experiencing the same problem? Yes: There is a network-wide problem. Contact your network administrator. No: Replace the logic board.

CD_ROM or DVD-ROM Vibration

CD-ROM or DVD-ROM vibration is typically caused by unbalanced discs when spinning at higher speeds in the internal CD-ROM or DVD-ROM drive. This vibration may cause the drive to have difficulty reading the disc.

Possible Cause

Possible Fix

Bad CD-ROM or DVD-ROM disc.

Try using a known-good compact disc.

CD-ROM or DVD-ROM Won't Eject

CD-ROM or DVD-ROM disc won't eject from the slot.

Possible Cause

Possible Fix

Bad CD-ROM or DVD-ROM disc.

1 Press and hold down the mouse button on startup. Note: This only works on iMac computers with Boot ROM version 2.3 or higher. To check the Boot ROM version, open Apple System Profiler/System Profile tab/Production information/Boot ROM Version.

2 Try manually ejecting the disc. Push a paper clip through the manual eject hole located on the right side of the CD/DVD slot. Refer to "Ejecting a CD or DVD Disc, Part 1 earlier in this chapter".

3 Restart the iMac after the disc ejects. If you don't restart, you will not be able to mount any subsequent discs that are inserted after you use the manual eject button.

Note: The power must be on to eject a CD or DVD disc.

If this doesn't solve the problem, continue with the procedures on the next page.

CD-ROM or DVD-ROM disc won't eject from the slot.

Possible Cause

Possible Fix

Uneven edge of the CD or DVD drive.

There are two internal levers on a slot-loading CD-DVD drive that help center a CD-DVD disc. Some CDs and DVDs have and uneven edge which can cause enough friction to prevent the disc from ejecting. If this happens, follow these steps:

1 Take a large paperclip and unbend it so that you can insert it into the CD/DVD slot (as shown below) about 1.5 inches from the left edge of the slot.

With the other hand, drag the disc icon on the desktop to the Trash to force the computer to eject the disc.

When you hear the disc attempt to eject, slide the paperclip to the left edge of the slot and then remove the paperclip. You should feel a little resistance from the spring loaded centering lever. Once the disc has been successfully ejected, wipe the outside edge of the CD/DVD with your hands. Cleaning the edge of the disc in this way will reduce the likelihood of the disc becoming stuck again.

Bottom housing not aligned properly.

Remove the bottom housing, and then replace the bottom housing. Ensure the tabs on the bottom housing align with the tab slots on the front outer bezel. Pay particular attention to the alignment of the center tab. Refer to the take-apart procedures for removing and reseating the bottom cover.

Bad CD-ROM or DVD-ROM drive.

Replace CD/DVD drive mechanism.

CD-ROM or DVD-ROM Not Showing on Desktop

CD-ROM and DVD-ROM problems are defined by the inability to see the CD or DVD on the desktop or to open a CD or DVD that is loaded into the drive.

Possible Cause

Possible Fix

Bad CD-ROM or DVD-ROM disc.

Try using a known-good compact disc.

CD-ROM or DVD-ROM disc didn't load properly.

Manually eject the disc and try again. Push a paper clip through the manual eject hole located on the right side of the CD/DVD slot. Restart the iMac after the disc ejects. Note: The power must be on to eject a CD or DVD disc.

Corrupted system software

If the CD-ROM or DVD-ROM drive fails to mount, boot off the system CD that came with the unit. Do you see the CD-ROM or DVD-ROM drive on the desktop now? Yes: Reinstall system software. (You must use the system software CD that came with the unit to get the correct version of the Mac OS.) No: Go to the next step.

Master/Slave switch set incorrectly on the back of the CD-ROM or DVD-ROM drive.

Make certain the Master/Slave switch (located under the CD Adapter board) on the drive is set to Slave. The Slave position is the switch closest to the CD Adapter connector on the back of the CD-ROM or DVD-ROM drive. The switch is set correctly at the drive vendor, but it may have been moved by mistake.

Loose cable.

Check all cables running to and from the CD-ROM or DVD-ROM drive at both ends and make sure they are attached securely.

Bad CD-ROM or DVD-ROM drive.

Replace CD-ROM or DVD-ROM drive.

Bad HD/CD/DVD data cable.

Replace the HD/CD/DVD data cable.

Bad logic board.

Replace the logic board.

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