Dell OptiPlex 390 Mini-Tower Owner's Manual page 72

LED
Power Button
Problem Description
Troubleshooting Steps Re-seat the 2x2 power connector from the power
LED
Power Button
Problem Description
Troubleshooting
Steps
LED
Power Button
Problem Description
Troubleshooting
Steps
72
add the peripheral cards back one by one until you find
the bad one.
Power connector not installed properly.
supply unit.
Possible peripheral card or system board failure has
occurred.
Remove all peripheral cards from the PCI and PCI-E
slots and re-start the computer. If the computer boots,
add the peripheral cards back one by one until you find
the bad one.
A possible system board failure has occurred.
• Disconnect all internal and external peripherals,
and re-start the computer. If the computer boots,
add the peripheral cards back one by one until you
find the bad one.