IBM Aptiva Series Hardware Maintenance page 72

Table 2- 2 Error Symptoms List
Error Symptoms
Hard disk or power-on
indicator LED does not
light. The machine
functions normally
otherwise.
Note: Ensure CD-ROM drive configuration is set correctly in BIOS
Setup, cable/jumper are set correctly and its laser beam is clean
before the any diagnosis of CD-ROM drive problems.
CD-ROM drive LED came
flashing and stayed on
more than 30 seconds
before shutting off.
Software asks to install
disc.
Software displays a
Reading CD error.
CD-ROM drive LED does
not flash if a disc is
loaded while system is
powered on and CD-
ROM drive power
connector has the
correct voltage.
CD-ROM drive LED does
not come on but CD-
ROM drive works
normally.
Action/FRU
Check hard disk LED connector
(CN20) voltages: (See "System
Board Layout" on page 5-2.)
CN20 Hard Disk Idle/Accessing
pin-1 +5 Vdc / +5 Vdc
pin-2 +5 Vdc /
pin-3 +5 Vdc /
pin-4 +5 Vdc / +5 Vdc
HDD LED cable
CD-ROM Drive
CD may have dirt or foreign material
on it, check with a known good disc.
CD is not inserted properly.
CD is damaged.
CD-ROM drive
CD-ROM drive
Check Procedures
0 Vdc
0 Vdc
2-19