Symptom Charts

System

1 Check cables.

2 Plug monitor directly into wall socket, and verify that monitor has power.

3 Replace power cord.

4 Replace power supply.

5 Replace logic board. Retain customer's SIMMs.

1 Replace power supply.

2 Replace logic board. Retain customer's SIMMs.

Does not power on— screen is black, fan is not running, and LED is not lit

Clicking, chirping, or thumping

System (Continued)

System shuts down intermittently

1 Make sure air vents on sides and top of case are unobstructed. Thermal protection circuitry may shut down system. After 30-40 minutes, system should be OK.

2 Replace power cord.

3 Check batteries. Refer to "Battery Verification" in Additional Procedures.

4 Replace power supply.

5 Replace logic board. Retain customer's SIMMs.

System intermittently crashes or locks

1 Make sure system software is correct version.

2 Make sure application software is known-good.

3 Replace SIMMs.

4 Replace logic board. Retain customer's SIMMs.

5 Replace power supply.

Video

Screen is dark, audio 1 and drive operate, fan 2 is running, and LED is lit 3

Adjust brightness on monitor.

Replace monitor. Refer to appropriate monitor manual to troubleshoot defective monitor.

Replace video cable.

Move video card to different slot.

Replace video card.

Quadra 700: Replace VRAM SIMMs.

Macintosh IIcx/IIci: Make sure ROM jumper is on.

Replace SIMMs.

Replace logic board. Retain customer's SIMMs. Replace power supply.

Video (Continued)

Screen is dark, audio and drive do not operate, but fan is running and LED is lit

1 Replace video cable.

2 Replace monitor. Refer to appropriate monitor manual to troubleshoot defective monitor.

3 Quadra 700: Replace VRAM SIMMs.

4 Macintosh IIcx/IIci: Make sure ROM jumper is on.

5 Remove NuBus cards.

6 Remove peripherals.

7 Replace SIMMs.

8 Replace logic board. Retain customer's SIMMs.

9 Replace power supply.

Video (Continued)

Partial or whole screen is bright and audio is present, but no video information is visible

1 Replace monitor. Refer to appropriate monitor manual to troubleshoot defective monitor.

2 Replace video cable.

3 Move video card to different slot.

4 Replace video card.

5 Replace logic board. Retain customer's SIMMs.

Screen is completely dark, fan is not running, and LED is not lit

1 Plug the monitor directly into a wall socket and verify that the monitor has power.

2 Check battery. Refer to "Battery Verification" in Additional Procedures.

3 Replace power supply.

4 Replace logic board. Retain customer's SIMMs.

Floppy Drive

Audio and video 1

present, but internal 2 drive does not operate 3

Disk ejects; display 1 shows icon with 2

blinking "X" 3

Replace disk with known-good system disk.

Verify that all external SCSI devices are disconnected.

Replace internal floppy drive cable.

Replace internal floppy drive.

Replace logic board. Retain customer's SIMMs.

Replace power supply.

Replace disk with known-good system disk. Replace internal floppy drive cable. Replace internal floppy drive. Replace logic board. Retain customer's SIMMs.

Floppy Drive (Continued)

Will not eject disk

Switch off computer. Hold mouse button down while you switch computer on. Eject disk manually. Replace floppy drive.

Attempts to eject disk, but doesn't

1 Push disk completely in.

2 Eject disk manually.

3 Replace floppy drive.

Hard Drive

Internal hard drive runs continuously

1 Replace hard drive data cable.

2 Replace internal hard drive.

3 Replace logic board. Retain customer's SIMMs.

Internal hard drive does not operate

1 Replace hard drive data cable.

2 Replace hard drive power cable.

3 Replace hard drive.

4 Replace logic board. Retain customer's SIMMs.

Works with internal hard drive or external SCSI device but not with both

Verify that SCSI select switch setting on external device is not 7 or same number as internal hard drive. Replace terminator on external device. Verify that internal hard drive has a terminator.

Peripherals

Cursor does not move

Reboot system. Check mouse connection.

If mouse was connected to keyboard, connect mouse to a computer ADB port instead and disconnect the keyboard. If mouse works, replace the keyboard.

If mouse does not work in any ADB port on computer, replace mouse.

Replace logic board. Retain customer's SIMMs.

Cursor moves, but clicking the mouse button has no effect

1 Replace mouse.

2 Replace logic board. Retain customer's SIMMs.

Peripherals (Continued)

Double-click doesn't open an application, disk, or server

1 Remove duplicate system files on the hard drive.

2 Clear parameter RAM. System 7: Hold down <Command> <Option> <P> <R> during startup but before "Welcome to Macintosh" appears. System 6 and earlier: Hold down <Shift> <Option> <Command> keys and select Control Panel from Apple menu.

3 If mouse was connected to keyboard, connect the mouse to a computer ADB port, and disconnect the keyboard. If mouse works, replace the keyboard.

4 If mouse does not work in any ADB port on computer, replace mouse.

5 Replace logic board. Retain customer's SIMMs.

Peripherals (Continued)

No response to any key on the keyboard

1 Check keyboard connection to ADB port.

2 Replace keyboard cable.

3 Replace keyboard.

4 Replace logic board. Retain customer's SIMMs.

Known-good 1

ImageWriter or 2

Imagewriter II does 3

not print 4

Make sure System is 6.0.4 and Finder is 6.1 (or later). Make sure the Chooser and Control Panel settings are correct. Replace printer interface cable. Replace logic board. Retain customer's SIMMs.

Known-good LaserWriter does not print

1 Make sure System is 6.0.4 and Finder is 6.1 (or later).

2 Make sure the Chooser and Control Panel settings are correct.

Miscellaneous

No sound from speaker

1 Verify that volume setting in the Control Panel is 1 or above.

2 Replace speaker.

3 Replace logic board. Retain customer's SIMMs.

Clock not running

1 Replace battery. See "Battery Verification" in Additional Procedures.

2 Replace logic board. Retain customer's SIMMs.

K Service Source

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