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Troubleshooting
HFS+ Formatted Drives/
-
29
as “Mac OS Standard”, while drives formatted with HFS+ will
appear as “Mac OS Extended.”
For more information on HFS+ formatting of hard drives, refer to
the Technical Info Library, article # 30344.
98
100
Table of Contents
Main Page
iMac
1
Hot Issues
2
Introduction
3
Mixed Memory Types
4
SGRAM Video Memory
5
Error Beeps
5
HFS+ Formatted Drives
6
Universal Serial Bus
7
Forcing a Restart
8
Basics
9
Overview
10
Front View
13
Rear View
14
Left Side View
15
Right Side View
16
Internal Locator
17
Data Buses
18
USB Support
19
Benefits of USB Technology
25
How a USB Device is Installed and Used
26
Connectivity Rules
32
Installing and Using a USB Device on a USB- Capable Mac OS Computer
33
10/100 BaseT Ethernet Support
35
Infrared Communication
36
IrDA vs. IRTalk
37
Modem
43
Modem Performance Issues
43
CD-ROM Drive
46
CD Adapter Board
46
Power Filter Board
47
Audio/Video Interconnect Board
48
Power Supply Board Fuse
49
Unlocking the Apple USB Mouse
50
Sound
53
Sound Input
53
Sound Output
54
Video Display
55
Backside Cache
56
SDRAM DIMMs
58
SGRAM Video Memory
61
iMac Logic Board
62
iMac I/O Panel
63
Repair Strategy
64
Ordering
64
USA Ordering
65
Canadian Ordering
66
Warranty/AppleCare
66
Canada Only
67
Specifications
68
Introduction
69
Troubleshooting
70
Introduction
71
Block Diagram
73
Power Flow
74
Power Supply Board Fuse
75
Testing for Power
76
At the AC Outlet
77
At the Logic Board
78
At the Power Supply to Power Filter Cable
80
At the Power Supply Board
81
At the Power Supply Board Fuse
83
The Cuda Chip
85
Resetting the Logic Board
86
Power-On Self Test
88
Video Flow
90
Sound In Flow
91
Sound Out Flow
93
Processor Module
95
Logic Board Battery
96
HFS+ Formatted Drives
97
Testing the Modem
100
Startup Problems Before Finder
103
No Power
104
No or Unstable Raster
105
Gray Screen Raster
106
Error Beep(s)
107
Flashing Question Mark
108
System Hangs During Boot
109
System Problems After Startup
111
System Hangs
112
Distorted Video
113
Tinting Video
114
Garbage Video
115
Memory Error Dialog
116
Network Problems
117
CD-ROM Problems
118
Hard Drive Problems
119
Sound Out Problems
120
IrDA Problems
121
USB Problems
122
Cursor Problems (A)
124
Cursor Problems (B)
125
USB Printer Problems
126
Networked Printer Problems
127
Modem Not Recognized
128
Modem Dialing Problems
129
Modem Not Connecting
131
Modem Dropping Connection
133
Modem Performance Issues
134
Take Apart
135
Tools
136
Lower Access Cover
137
Logic Board/Mass Storage Chassis
140
Logic Board
143
Routing Logic Board Cables
148
Modem
149
Processor Card
151
I/O Panel
156
SDRAM
159
Processor Shield Frame
161
CD-ROM
163
CD-ROM Carrier Replacement
165
CD-ROM Bezel
167
Hard Drive
170
Hard Drive Carrier Replacement
174
Power Filter Board
175
Fan
177
Audio/Video Interconnect Board
180
Bottom Rear Housing
184
Font Lower Panel
187
Speakers
189
IrDA Board
191
Headphone/Power Board
193
Front Outer Bezel
195
Front Inner Bezel
198
Top Rear Housing
202
EMI Shield
205
Analog/Video Board
207
Power Supply Board
213
CRT
218
Microphone
223
I/O Door
226
Serial Number and Ethernet Address
227
CRT Frame
228
Upgrades
233
SDRAM
234
VRAM
240
Adjustments
245
Light Meter Setup
246
Model R77
246
Model L-248
250
Model 246
251
Geometry
252
Using Monitors & Sound Control Panel
253
Video
254
Cutoff
255
White Balance
263
Focus
269
Read Me File
270
Display Adjustment Utility v. 1.1
270
Geometry Adjustments
271
Color Adjustments
272
Exploded View
273
iMac Exploded View
274
Logic Board/Mass Storage Chassis Exploded View
275
iMac Screw Matrix
276
Parts List
277
Emergency Handbook Includes troubleshooting, hard disk repair, and software installation information for your iMac
279
Contents
281
1 Problems Starting Up7
281
Problems7
281
Computer won’t start up, restart, or shut down7
281
Single icon appears in middle of screen8
281
Computer beeps8
281
Computer freezes8
281
Message appears9
281
Normal desktop doesn’t appear10
281
Hard disk icon doesn’t appear on desktop10
281
Computer starts up from wrong disk11
281
Solutions11
281
Take notes.11
281
Wake up your computer.11
281
Restart the computer.12
281
Force your computer to restart.12
281
Shut down the computer.12
281
Force your computer to shut down.13
281
Quit open applications.13
281
Make sure your computer is getting power.13
281
Make sure the screen is properly adjusted.13
281
Make sure external devices are properly connected and turned on.14
281
Check RAM disk settings in the Memory control panel.15
281
Increase the memory available for system software.15
281
Reset the window display.16
281
Re-bless the System Folder.16
282
Make sure you’re using the correct disk as a startup disk.16
282
CD disc is jammed.17
282
Resolve system extension conflicts.17
282
Reset the PRAM.19
282
Make sure memory is installed correctly.20
282
Replace the computer’s backup battery.20
282
Test and repair the hard disk directory.21
282
Reinstall system software.21
282
Where to Find Onscreen Help22
282
MacOS Help22
282
MacOS Info Center22
282
2 Problems Using Your Computer23
282
Problems With Applications, Documents, and Memory23
282
Problems With Hard Disks, CDs, and Other Storage Media29
282
Problems With Hard Disks29
282
Problems With CD Drives and Discs30
282
Problems Using ISO 9660 or High Sierra Discs32
282
Problems Using Photo CDs33
282
Problems Playing Audio CDs33
282
Problems With USB Devices33
282
Problems Printing35
282
Performance and Other Problems36
282
Problems With Networks and File Sharing39
282
Problems With Sound and Video41
282
3 Starting Up From a CD45
282
Starting Up From the Software Install CD45
282
4 Testing and Repairing Your HardDiskDirectory47
282
Repairing Corrupted Data on Your Disk47
282
If Disk First Aid Cannot Correct the Problem48
282
Updating the Hard Disk Drivers49
282
Initializing a Hard Disk49
282
MacOS Extended Format50
282
Testing Your Hard Disk for Physical Damage50
283
5 Reinstalling Your Computer’s Software53
283
Reinstalling System Software53
283
Before Installing System Software53
283
Reinstalling Mac OS System Software54
283
Selecting Which Software to Install55
283
Performing a Clean Installation58
283
Reinstalling Your Custom Extensions, Fonts, and Control Panels59
283
If the Clean Installation Didn’t Solve the Problem60
283
Problems During Installation60
283
Responding to Messages About Your Hard Disk62
283
Reinstalling Individual Applications62
283
Restoring All Original Software63
283
Before Restoring Your Software63
283
Restoring In Place63
283
Erasing Your Hard Disk64
283
6 Contacting Apple for Help65
283
Obtaining Information via the World Wide Web65
283
Have This Information Available Before Calling66
283
Using the Apple System Profiler66
283
Index67
283
Problems Starting Up
285
Problems
285
Computer won’t start up, restart, or shut down
285
Single icon appears in middle of screen
286
Computer beeps
286
Computer freezes
286
Message appears
287
Normal desktop doesn’t appear
288
Hard disk icon doesn’t appear on desktop
288
Computer starts up from wrong disk
289
Solutions
289
Take notes.
289
Wake up your computer.
289
Restart the computer.
290
Force your computer to restart.
290
Shut down the computer.
290
Force your computer to shut down.
291
Quit open applications.
291
Make sure your computer is getting power.
291
Make sure the screen is properly adjusted.
291
Make sure external devices are properly connected and turned on.
292
Check RAM disk settings in the Memory control panel.
293
Increase the memory available for system software.
293
Reset the window display.
294
Re-bless the System Folder.
294
Make sure you’re using the correct disk as a startup disk.
294
CD disc is jammed.
295
Resolve system extension conflicts.
295
Reset the PRAM.
297
Make sure memory is installed correctly.
298
Replace the computer’s backup battery.
298
Test and repair the hard disk directory.
299
Reinstall system software.
299
Where to Find Onscreen Help
300
MacOS Help
300
MacOS Info Center
300
Problems Using Your Computer
301
Problems With Applications, Documents, and Memory
301
Problems With Hard Disks, CDs, and Other Storage Media
307
Problems With Hard Disks
307
Problems With CD Drives and Discs
308
Problems Using ISO 9660 or High Sierra Discs
310
Problems Using Photo CDs
311
Problems Playing Audio CDs
311
Problems With USB Devices
311
Problems Printing
313
Performance and Other Problems
314
Problems With Networks and File Sharing
317
Problems With Sound and Video
319
Starting Up From a CD
323
Starting Up From the Software Install CD
323
When You’re Done With the CD
324
Testing and Repairing Your HardDiskDirectory
325
Repairing Corrupted Data on Your Disk
325
If Disk First Aid Cannot Correct the Problem
326
Updating the Hard Disk Drivers
327
Initializing a Hard Disk
327
MacOS Extended Format
328
Testing Your Hard Disk for Physical Damage
328
Reinstalling Your Computer’s Software
331
Reinstalling System Software
331
Before Installing System Software
331
Reinstalling Mac OS System Software
332
Selecting Which Software to Install
333
Standard Installation
334
Custom Installation
334
Performing a Clean Installation
336
Reinstalling Your Custom Extensions, Fonts, and Control Panels
337
If the Clean Installation Didn’t Solve the Problem
338
Problems During Installation
338
Responding to Messages About Your Hard Disk
340
Reinstalling Individual Applications
340
Restoring All Original Software
341
Before Restoring Your Software
341
Restoring In Place
341
Erasing Your Hard Disk
342
Contacting Apple for Help
343
Obtaining Information via the World Wide Web
343
Have This Information Available Before Calling
344
Using the Apple System Profiler
344
Index
345
Untitled
326
Other manuals for Apple IMac
User Guide
104 pages
Installation Instructions
6 pages
Technician Guide
287 pages
Information Guide
16 pages
Quick Start Guide
20 pages
Essentials
52 pages
Installation
60 pages
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