Apple iMac (Slot Loading) Spécifications Page 75
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Troubleshooting Symptom/Cure Tables: System Problems After Startup - 47
USB Problems
USB problems refer to symptoms or issues that may occur with external USB devices
that are attached to the iMac. This could include Apple and/or third-party USB devices.
Possible Cause Possible Fix
Not enough power for the
USB device to function.
The following error message will appear confirming that a
device cannot function at all due to a lack of power. This
lack of power (depending on the device) can be a result
of a disconnected external power source, or not enough
power available from the hub the device is connected to.
The two corrective steps listed in the dialog box (shown
on the next page) provide the user guidance in
troubleshooting these conditions.
USB device experiencing a
partial lack of power.
Similar to the first error message, this error message indicates
a device may not completely function due to a partial lack of
power and gives steps to remedy the problem.
- Special Edition 1
- Overview 4
- Basics Overview - 2 5
- New Technologies 6
- FireWire 7
- VGA Output Port 8
- Features 9
- Graphics Support 11
- Communication 11
- CPU Speed 13
- L2 Cache 13
- System Bus Speed 14
- Main Memory 14
- Graphics Controller Chip 15
- Graphics Memory 15
- Hard Disk Drive 16
- CD Drive 16
- Front, Side, and Rear 18
- I/O Panel with FireWire 19
- I/O Panel without FireWire 20
- iMac Logic Board 21
- Repair Strategy/Warranty 22
- USA Ordering 23
- Warranty 24
- Canada Only 25
- Specifications 26
- Introduction 27
- Troubleshooting 28
- iMac, iMac DV, iMac DV 28
- Block Diagram 30
- Power Flow 31
- Testing for Power 32
- At the Logic Board 33
- The PMU Chip 37
- Power-On Self Test 39
- Power Button 40
- Logic Board Battery 41
- HFS Plus Formatted Drives 44
- Testing the Modem 45
- Before the Finder Appears 47
- No Power 48
- Possible Cause Possible Fix 49
- No Video or Unstable Raster 50
- Gray Screen 52
- Error Beep(s) 53
- Flashing Question Mark 54
- System Hangs During Boot 55
- After Startup 57
- System Hangs 58
- Distorted Video 59
- Thin White Line 60
- Tinting Video 61
- Garbage Video 62
- Memory Error Dialog 64
- Can’t Wake From Sleep 65
- Network Problems 66
- CD_ROM or DVD-ROM Vibration 67
- CD-ROM or DVD-ROM Won’t Eject 68
- Hard Drive Problems 71
- Sound Out Problems 72
- Sound In Problems 73
- USB Problems 75
- Cursor Problems 77
- USB Printer Problems 78
- Networked Printer Problems 79
- Modem Not Recognized 80
- Modem Dialing Problems 81
- Take Apart 82
- Procedures 84
- 5. Lift the bottom housing 87
- Replacement Caution: 88
- EMI Cover 89
- Take Apart EMI Cover - 8 90
- 1. Remove the six screws 90
- SDRAM DIMM 93
- CD/HD Carrier 101
- CD-ROM / DVD-ROM 105
- Important: 107
- Manual Eject Button 110
- CD-ROM or DVD-ROM 112
- Module Replacement 112
- CD/DVD Adapter 115
- Hard Drive 117
- Hard Drive Replacement 120
- Logic Board 121
- Replacement Note: 126
- Identifying the Version 2 128
- 350 MHz Logic Board 128
- Down Converter Board 131
- Adjustments 136
- Adjustment Tools 137
- Light Meter Setup 138
- Model R77 139
- Caution: 141
- Jumper Adjustment 142
- Warning: 143
- Focus Adjustment 146
- Screen Voltage 149
- Cutoff Adjustment 156
- White Balance 166
- 9. Click the Factory 172
- Settings button 172
- Geometry Adjust 173
- S Correction 179
- Adjustment 179
- Sticking Power 184
- LED Alignment 187
- Procedure 187
- 2. Lift the bottom housing 188
- Inner Bezel Sanding 192
- Reimbursement Procedure 193
- Note: The modem is located 196
- Take Apart Modem - 5 7 198
- 3. Turn the logic board to 198
- Note: As you slide the I/ 199
- Modem Replacement 200
- I/O Panel 201
- Take Apart I/O Panel - 62 203
- 3. Turn the logic board 203
- Front Outer Bezel 205
- 2. After removing the tabs 207
- Note: The bezel tabs fit 208
- ±Warning: This product 210
- 2. Pry the tabs off, and 212
- 6. Lift the top rear housing 215
- Divider Panel 216
- 6. Open the CRT cable 220
- Caution: Be careful when 225
- 13. Loosen the CRT neck 226
- 14. Carefully pull the video 227
- Note: Continue with the 228
- 16. Remove the following 229
- 922-4044 230
- Power/Analog/Video 231
- 12. Loosen the CRT neck 240
- 13. Carefully pull the video 241
- 14. Holding on to the side 242
- Replacement Note: If 244
- Identifying the Rev. 2 245
- Important: The switch 246
- Note: To separate the left 251
- Take Apart Side Panels - 111 252
- Take Apart Antenna - 114 255
- • bottom housing 255
- • front outer bezel 255
- • top rear housing 255
- • divider panel assembly 255
- Take Apart Antenna - 115 256
- 1. Remove the three screws 256
- Important: Note how the 257
- Take Apart Antenna - 117 258
- 3. Carefully remove the 258
- Speakers 260
- Note: If you are certain 261
- CRT Switch Settings on 268
- Replacing the Microphone 272
- Take Apart Microphone - 132 273
- 3. Check that the 273
- Replacement Note: If you’re 359
- Take Apart Side Panels - 108 364
- Take Apart Antenna - 111 367
- Take Apart Antenna - 112 368
- Take Apart Microphone - 127 383
- Upgrades 388
- AirPort Card 395
- Protective 397
- Guide Rails 397
- Connect an 402
- External Monitor 402
- Vented Cover VGA Vented Cover 404
- Vented Cover 405
- VGA Vented Cover 406
- Exploded View 408
- Exploded View 1 409
- Colored Service Parts 410
- Cable Locator 411
- Screw Matrix 412
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