Motorola 660AV - Manual (Page 27)

Troubleshooting Symptom Charts/Video
(Continued)
- 9
Video
(Continued)
Screen is black, audio
and drive do not
operate, but fan is
running and LED is lit
1 Remove peripherals and cards.
2 Remove expansion card.
3 Replace DRAM SIMMs. See Memory
4 manual.
5 Replace power supply.
6 Replace logic board.
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 Replace video card, if installed.
4 Clear parameter RAM. Hold down <Command> <Option> <P>
<R> during startup but before “Welcome To Macintosh”
appears.
5 Replace logic board. Retain customer’s SIMMs.