50 IBM Desktop System HMM
Hard disk drive format error. Enter BIOS Setup and Load
default settings.
Hard disk drive cable.
Hard disk drive.
System board.
Hard disk drive write error. Enter BIOS Setup and Load
default settings.
Hard disk drive.
Hard disk drive LED fails to
light, but system operates
normally.
With the system power on,
measure the voltage of hard
disk LED connector CNN1.
The reading should be:
CNN1 HDD Idle/ Active
pin-8 +5 Vdc / --
pin-7 +5 Vdc / 0
Vdc
See “System Board
Jumpers and Connectors”
on page 105.
Hard drive LED cable.
CD-ROM Drive
NOTE: Ensure CD-ROM drive is c onfigured correctly in
BIOS Setup, cable/jumper are set correctly and its
laser beam is clean be fore diagnosing an y
CD-ROM drive problems.
CD-ROM drive LED flas hes
for more than 30 seconds
before LED shut off.
Software asks to reinstall
disc.
Software displays a reading
CD error.
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 LED doesn't
come on but works
normally.
CD-ROM drive
Table 2-3 Error Symptoms List (Continued)
NOTE: To diagnose a problem, first find the error symptom
in the left column. If directed to a check procedure,
replace the FRU indicate d in the check proc edure. If
no check procedure is in dicated, the first Action/
FRU listed in right column is the most likely cau se.
Error Symptoms Action/FRU