User Manual
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BetrHbKRC2FL--USA--Fehler 11.04.00 en
3.1.5 Fault profile checklist
Main switch on PC to “ON”, system fails to boot, display stays dark, power supply
fan and CPU fan do not work
Possible causes:
-- Power supply defective
-- Short circuit on the motherboard
-- Short circuit on a connected device
Elimination of fault:
-- Disconnect all devices from the power supply unit. Switch on PC and measure output
voltages at the power supply unit. If an output voltage is too low, exchange the power
supply unit.
-- Connect the power supply to the motherboard with the power supply unit switched off.
Switch on PC and measure supply voltages at the power supply unit. If an output
voltage is too low, exchange the PC rack (motherboard fault).
-- Reconnect each device in turn to the power supply unit (drives, plug--in cards) with the
power unit switched off. Switch on PC and measure output voltages at the power
supply unit. If an output voltage is too low, exchange the device in question.
System does not boot, display stays dark
Possible causes:
-- Ribbon cable not correctly connected (male connector without coding)
-- Defective expansion card (Interbus, MFC, KVGA)
-- Memory modules (RAM modules) not correctly snapped into place (contact fault)
-- Memory modules defective
-- Defective motherboard
Elimination of fault:
-- Connect ribbon cable correctly (red marking on the ribbon cable corresponds to pin 1)
-- Disconnect expansion cards (Interbus, Ethernet card) and test system again; replace
expansion cards if necessary
-- Snap memory modules correctly into place
-- Exchange memory modules
-- Exchange PC rack
System boots sporadically, display stays dark
Possible causes:
-- Incorrect BIOS version
Elimination of fault:
-- Carry out BIOS update
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