Dell Precision R5500 (Early 2011) - Manual (Page 79)

Light Pattern Problem Description Troubleshooting Steps
Diagnostic LEDs Power Button LED
Memory modules are
detected, but a memory
failure has occurred.
• 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.
A possible graphics card
failure has occurred.
• 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.
A possible floppy drive or
hard drive failure has
occurred. Re-seat all power and data
cables.
A possible USB failure has
occurred Re-install all USB devices
and check all cable
connections.
No memory modules are
detected.
• 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
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