Dell Precision T5600 (Mid 2012) - Manual (Page 53)

computer boots, add the
peripheral cards back one by
one until you find the bad one.
• If the problem persists, the
system board / system board
component is faulty.
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.
• If the problem persists, the
system board is faulty.
Some other failure has occurred.
• Ensure that the display/
monitor is plugged into a
discrete graphic card.
• Ensure that all hard drives
and optical-drive cables are
properly connected to the
system board.
• If there is an error message
on the screen identifying a
problem with a device (such
as the floppy drive or hard
drive), check the device to
make sure it is functioning
properly.
• If the operating system is
attempting to boot from a
device (such as the floppy
drive or optical drive), check
system setup to ensure the
boot sequence is correct for
the devices installed on your
computer.
System is in Recovery Mode
• BIOS checksum failure was
detected and the system is
now in recovery mode.
Boot hand off
• Indicates end of POST
process. LEDs are normally in
this state briefly as POST
completes. Once the hand-off
to the operating system is
done, the LEDs turn off .
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