Apple emac ati usb2 2005 서비스 매뉴얼

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42 - eMac ATI Graphics/USB 2.0/2005 Troubleshooting
Mass Storage Symptom Charts
CD or DVD won’t mount to the desktop
1.
Try cleaning the disc. If it is dirty or scratched, it may not mount.
2.
Boot from Apple Hardware Test (hold down the “C” key at startup). Run both quick and extended tests. 
Proceed based on any error codes given. See AppleCare Knowledge Base article 112125 - Service 
Diagnostics Matrix for Error Code information.
3.
Try a known good disc.
4.
Refer to the “Flashing Question Mark” symptoms mentioned in this section.
5.
Perform a clean install with the CD that came with the computer.
6.
Replace the optical drive cable.
7.
Replace the optical drive.
8.
Replace the logic board.