Apple imac 20 inch early 2008 User Manual
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iMac (20-inch Early 2008) — Symptom Charts 271 Keyboard is not discoverable To pair your aluminum Apple Wireless Keyboard with your Macintosh computer, the keyboard needs to be in a ‘discoverable mode.’ Note: If you need to put the older Apple Wireless Keyboard in a discoverable mode for pairing, see the previous topic. Follow these steps to put the aluminum Apple Wireless Keyboard in a discoverable mode: Open the Bluetooth Setup Assistant on your Mac:1. For Mac OS X 10.4.10 or late• r For Mac OS X 10.5 or late• r Turn on the keyboard by pressing the Power button on the right side of the keyboard. 2. The Power On light (top right corner) will begin to blink and the Setup Assistant can then scan for the keyboard in order to pair it to your computer. Follow the onscreen instructions to complete pairing your keyboard.3. Wireless Keyboard Connection Lost The following image appears on the desktop:1. Reset the Apple Wireless Keyboard. Turn the power switch off for several seconds, and turn it 2. back on. Wait a few moments after turning on the keyboard so that it can pair itself to your computer. If the keyboard is still not discoverable, go on to the next step. Follow the steps listed in the previous symptom, “3. Keyboard is not discoverable.”
iMac (20-inch Early 2008) — Symptom Charts 272 Some keys are working on the Wireless keyboard If some keys are working, but others behave as if the Caps Lock is “ON”, and the customer was using an extended keyboard (with a number pad), but switched to an Apple Wireless keyboard, check the following setting and try the wireless keyboard again. Turn “Off” Mouse Keys under System Preferences-->Universal Access-->Mouse. • Additional Wireless Topics Can’t wake the computer with the wireless keyboard or wireless mouse Refer to Knowledge Base document 86496 - Apple Wireless Keyboard and Mouse: Troubleshooting connection Issues. Can’t maintain a wireless connection between the computer and keyboard or mouse Refer to Knowledge Base document 86496- Apple Wireless Keyboard and Mouse: Troubleshooting connection Issues. Using the an Apple Wireless Keyboard and Mouse Refer to Knowledge Base document 306461 - Using an Apple Wireless Keyboard and Mouse.
iMac (20-inch Early 2008) — Symptom Charts 273 Bluetooth: How to Set Up Your Apple Wireless Mouse Refer to Knowledge Base document 86468 - Follow the instructions in this document to set up your Apple Wireless Mouse. Bluetooth: How to Se Up your wireless Mighty Mouse Refer to Knowledge Base document 303921 - Follow the instructions in this document to set up your Apple Wireless Mighty Mouse.
iMac (20-inch Early 2008) — Symptom Charts 274 Error Beep(s) Power On Self Test (POST) Tones Intel-based Mac computers such as the iMac (20-inch Mid 2007) rely on a combination of tones and blinking LEDs to display Power On Self Test (POST ) error codes. If the computer detects out-of-specification or no SDRAM or the RAM installed does not • meet the appropriate specifications, the screen will remain black but the computer will beep This error condition may be due to physically damaged RAM, installing the incorrect type of RAM, or not having RAM installed. Some RAM may appear to pass the Power-On-Self-Test (POST ) but still cannot be used by • the operating system. In this case, the computer will display a gray screen, sound three tones and repeat the tones until the computer is turned off. The solution to both of these situations is to first re-seat the memory and test the computer • again. If the memory fails the POST test again, try memory that has been verified to work correctly on another system (i.e., “known-good”) or order new memory. iMac display is black and the system beeps nine times (3 short, 3 long, 3 short), then repeats In order to recover from this error condition perform the following steps: Disconnect the power cord from the iMac1. Remove the memory access door.2. Remove the glass panel.3. Remove the front bezel.4. Remove the small coin battery located on the logic board near the right speaker. Wait 30 5. seconds. Reinstall the battery.6. Connect the power cord to the iMac.7. Verify that the system powers up correctly.8.
iMac (20-inch Early 2008) — Symptom Charts 275 USB USB port is not recognizing known devices Please unplug all of your USB devices from your iMac except your Apple Keyboard and Apple 1. mouse. Now plug your device directly into the back of your iMac. Does it work as expected now? 2. Yes: Your device works when plugged directly into the computer. This indicates a conflict with one of the other USB devices. You can test by gradually adding your devices back and seeing where the issue occurs, then contacting the manufacturer of the device for assistance. No: Unplug your device from the iMac and plug the keyboard into the port your device just occupied. Is your keyboard still working? Yes: Your Apple Keyboard works when plugged into the USB port your device was plugged into. This points to an issue with your device. Please review the documentation that came with your device. Install any necessary drivers and contact the manufacturer of your device for assistance. No: Replace the logic board I see a message saying not enough power to function It appears that this device needs to be plugged into the computer’s USB port, rather than the keyboard USB port. Any USB device connected to the keyboard needs to be either a self-powered device (a USB device with its own AC power supply), or a low-power device (a device that does not need a large amount of voltage to operate). Your device may draw more power than the keyboard can provide.
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iMac (20-inch Early 2008) Take Apart 278 iMac (20-inch Early 2008)—Upper Exploded View LVDS Cable 922-8197 LCD Assembly, 20” 661-4671Front Bezel 922-8582 Glass Panel, Cover 922-8514 LCD Temp Sensor 922-8235 Cable, LCD Temp Sensor 922-8234 Clip, Temp Sensor 922-8183 Power Supply 661-4670, 180W Hard Drive 661-4632, 250 GB, 7200, SATA 661-4633, 320 GB, 7200, SATA 661-4634, 500 GB, 7200, SATA 661-4635, 750 GB, 7200, SATA Optical Drive, 8x 661-4637 Optical Sensor Cable 922-8194 Cable, Optical Flex, DATA 922-8502 Clip, Optical Bd 922-8214 Cable, HD Sensor922-8196 Clip, Hard Drive922-8517 Clip, Temp Sensor Pkg of 5 922-8183 Cable, HD SATA 922-8195 Pins, Hard Drive922-7001 Speaker, right 922-8506 Speaker, Left922-8505 Cable, AmbientTemp Sensor 922-8191
iMac (20-inch Early 2008) Take Apart 279 iMac (20-inch Early 2008)—Lower Exploded View Video Card 661-4672, ATI Radeon HD 2600XT 661-4673, ATI Radeon HD 2400XT SDRAM Access Door 922-8186 Logic Board 661-4674, 2.4 GHz 661-4675, 2.66 GHz Cable, Ambient Temp Sensor 922-8191 Stand 922-8518 Microphone Cable 922-8190 Mechanism, 20” 922-8221 Camera Cable 922-8189 Rear Cover 922-8515 Cable, AC / DC / SATA Power / Inverter 922-8188 IR Board 922-8169 Cable, IR 922-8504 SDRAM 661-4661 1 GB, DDR2-800, SO-DIMM 661-4662 2 GB, DDR2-800, SO-DIMM Mechanism Cover 922-8220 Inverter Cover922-8215 Inverter Board 922-8507 Cable Cover, w/gasket 922-8516 Camera Board922-8511 Audio Board922-8466 Cable, Audio Board 922-8463 Bluetooth Board 922-8467 Cable, Bluetooth Board 922-8503AirPort Card 661-4594 Temp Sensor Cable 922-8191 CPU Fan 922-8509 Optical Fan 922-8508Hard Drive Fan 922-8510 Ambient Temp Sensor 922-7792
iMac (20-inch Early 2008) Take Apart — Screw Chart 280 Screw Chart Screw Chart: Page 1 of 3 Note: Screws are not to scale. 922-6800 T10 - Logic board to rear cover (4) -Power supply to rear cover (2) - AC power inlet to rear cover (3) - Cable guide to rear cover 922-6850 T10 Chassis to rear cover (6) 922-8250 T10 Chassis to rear housing, at top of chassis (3) 922-7010 T6 - Bluetooth card to Logic - AirPort card to Logic - LVDS cable to Logic - Audio board 922-8256 T6 IR board to heatsink (2) 922-8171 T8 Camera assembly to rear housing