Apple IMAC User Manual - Page 107
System Hangs/Freezes During Boot, Symptom Charts/ System Hangs/Freezes During Boot - 25
UPC - 067540444435
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Troubleshooting Symptom Charts/ System Hangs/Freezes During Boot - 2 5 System Hangs/Freezes During Boot System begins a normal startup process with a boot chime and normal display, but then freezes before the Finder appears. 1 Boot with Extensions off by holding down the Shift key during startup. (See TIL article #14343 for more information on possible Extension conflicts.) Does the system startup successfully with Extensions off? Yes: Begin adding back the system Extensions one at a time and starting up the system after each addition. If the system freezes again, you know that the last Extension you added is causing the problem. No: Go to the next step. 2 Boot from the system CD that came with the unit. Does the system startup successfully? 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: Reseat the SDRAM. If the problem persists, replace the SDRAM (one DIMM at a time) with known- good SO-DIMMs. 3 Bad USB device. Turn off the computer and disconnect all USB devices. Next, power on the system using the power button on the front of the unit, and begin adding back the USB device one at time, beginning with the keyboard and then the mouse, and so on. If the system hangs only after you reconnect a particular USB device, replace that USB device. 4 The hard drive or its software drivers are most likely the problem. Can you see the hard drive using Drive Setup? Yes: Use Drive Setup 1.5.1 to reinstall the software drivers for the hard drive. If the problem persists, use Drive Setup 1.5.1 to reinitialize the hard drive (See TIL article #22206 for Drive Setup information.) ±Warning: You will lose all data on the hard drive when you reinitialize it. Backup the data first if possible. No: Go to next step. 5 If you don't see the hard drive using Drive Setup: - Check all cable connections to and from the hard drive. - Replace the hard drive/CD data cable. - Replace the hard drive. - Replace the hard drive power cable 6 Disconnect all external devices (USB and Ethernet). Then begin reconnecting these devices one at a time (beginning with the keyboard and then the mouse) and start up the computer after each device is connected to see if one of the external devices is causing the problem. If the problem occurs after you connect a particular external device, replace the device in question.