Dell Precision R5500 Owner's Manual page 65

Light Pattern
Diagnostic LEDs
Problem Description
Power
Button
LED
A possible coin cell battery failure
has occurred.
The computer is in a normal on
condition. The diagnostic lights
are not lit after the computer
successfully boots to the
operating system.
A possible processor failure has
occurred.
Memory modules are detected,
but a memory failure has
occurred.
A possible graphics card failure
has occurred.
A possible floppy drive or hard
drive failure has occurred.
A possible USB failure has
occurred
No memory modules are
detected.
Memory modules are detected,
but a memory configuration or
compatibility error has occurred.
Troubleshooting Steps
• If the problem persists, the system board is faulty.
Remove the coin cell battery for one minute, reinstall
the battery, and restart.
Ensure that the display is connected and powered on.
Re-seat the processor.
• If two or more memory modules are installed,
remove the modules (see your service manual),
then re-install one module (see your service
manual) and re-start the computer. If the
computer starts normally, continue to install
additional memory modules (one at a time) until
you have identified a faulty module or reinstalled all
modules without error.
• If available, install working memory of the same
type into your computer.
• Ensure that the display/monitor is plugged into a
discrete graphic card.
• Re-seat any installed graphics cards.
• If available, install a working graphics card into your
computer.
Re-seat all power and data cables.
Re-install all USB devices and check all cable
connections.
• If two or more memory modules are installed,
remove the modules, then reinstall one module and
restart the computer. If the computer starts
normally, continue to install additional memory
modules (one at a time) until you have identified a
faulty module or reinstalled all modules without
error.
• If available, install working memory of the same
type into your computer.
• Ensure that no special requirements for memory
module/connector placement exist.
• Ensure that the memory you are using is supported
by your computer.
Troubleshooting 65