Power Supply Self-Test - Dell OptiPlex 755 User Manual

• Ensure that the main power cable and front panel cable are securely connected to the system board (see the "System
Board Components" section for your computer).
• Perform the power supply self-test, if applicable (see "Power Supply Self-Test" on page 340).
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F T H E P O W E R L I G H T I S B L I N K I N G A M B E R
problem may exist.
• Ensure that the voltage selection switch is set to match the AC power at your location (if applicable).
• Ensure that all components and cables are properly installed and securely connected to the system board (see the
"System Board Components" section for your computer).
• Perform the power supply self-test, if applicable (see "Power Supply Self-Test" on page 340).
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F T H E P O W E R L I G H T I S S T E A D Y A M B E R
• Ensure that the processor power cable is securely connected to the system board power connector (POWER2) (see
the "System Board Components" section for your computer).
• Remove and then reinstall all memory modules (see "Memory" on page 313).
• Remove and then reinstall any expansion cards, including graphics cards (see the "Cards" section for your computer).
• Perform the power supply self-test, if applicable (see "Power Supply Self-Test" on page 340).
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L I M I N A T E I N T E R F E R E N C E
• Power, keyboard, and mouse extension cables
• Too many devices connected to the same power strip
• Multiple power strips connected to the same electrical outlet

Power Supply Self-Test

CAUTION:
. Before you begin any of the procedures in this section, follow the safety instructions in the
Information Guide
If your mini tower, desktop, or small form factor computer has been certified for ENERGY STAR
then your power supply is equipped with a self-test feature to help with troubleshooting power problems.
The self-test feature can be performed with the power supply connected to computer devices or in
isolation. The test button and LED are accessible externally on the back of the power supply (where the
AC plug is located).
NOTE:
The power supply self-test feature is available only with ENERGY STAR 4.0 power supplies.
340
Solving Problems
— The computer is receiving electrical power, but an internal power
— A device may be malfunctioning or incorrectly installed.
— Some possible causes of interference are:
.
1
1
test button
2
test LED
2
Product
®
4.0,