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99 Chapter 4
Error Symptoms List
NOTE: To diagnose a problem, first find the error symptom in the left column. If directed to a check procedure,
replace the FRU indicated in the check procedure. If no check procedure is indicated, the first Action/
FRU listed in right column is the most likely cause.
Error Symptom Action/FRU
Processor / Processor Fan
NOTE: Normally, the processor fan should be operative, and the processor clock setting should be
exactly set to match its speed requirement before diagnosing any processor problems.
Processor fan does not run but power supply
fan runs.
1. Ensure the system is not in power saving mode. See “Power
Management” in chapter 2.
2. With the system power on, measure the voltage of processor fan
connector. Its reading should be +12Vdc. Its reading should be
+12Vdc. If the reading shows normal, but the fan still does not
work, then replace a good fan.
3. Main board.
Processor test failed.
1. Processor.
2. Main board.
Main board and Memory
NOTE: Ensure the memory modules are installed properly and the contact leads are clean before
diagnosing any system problems.
Memory test failed. 1. See "Memory"
2. Main board
Incorrect memory size shown or repeated
during POST.
1. Insert the memory modules in the DIMM sockets properly, then
reboot the system.
2. Memory module.
3. Main board.
System works but fails to enter power saving
mode when the Power Management Mode
is set to Enabled.
1. Enter BIOS Setup and load default settings.
In Windows Systems, check settings in Power Management
Property of Control Panel.
2. Reload software from Recovery CD.
Blinking cursor only; system does not work. 1. Diskette/IDE drive connection/cables
2. Diskette/IDE disk drives
3. See “Undetermined Problems”.
4. Main board
Diskette Drive
NOTE: Ensure the diskette drive is auto-setting in BIOS Setup and its read/write head is clean before
diagnosing any diskette drive problems.(If only one drive is installed, please make sure the
drive is connected to master connector or the drive is set to master.)
Media and drive are mismatched. 1. Ensure the diskette drive is configured correctly in the Disk
Drives of BIOS Setup.
2. Ensure the diskette drive is correctly formatted.
3. Diskette drive connection/cable
4. Diskette drive
5. Main board
Diskette drive does not work. 1. Ensure the diskette drive is not set to None in the Disk Drives of
BIOS Setup.
2. Diskette drive power
3. Diskette drive connection/cable
4. Diskette drive
5. Main board
Diskette drive read/write error. 1. Diskette.
2. Diskette drive cable.
3. Diskette drive.
4. Main board.