Dell Precision Tower 7810 Owner's Manual page 58

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A possible Motherboard,
Memory, or CPU failure has
occurred
A possible coin cell failure has
occurred.
System is in Recovery Mode
A possible processor failure has
occurred
Memory modules are detected,
but a memory power failure has
occurred.
PCI device configuration activity
is in progress or PCI device
failure was detected.
A possible HDD or USB failure
has occurred.
No memory modules installed
Check the PSU cabling to
Motherboard to make sure that
all cables are installed correctly.
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.
BIOS checksum failure was
detected and the system is now
in recovery mode.
Re-seat the processor
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.
Remove all peripheral cards from
the PCI and PCI-E slots and
reboot the computer. If the
computer boots, add the
peripheral cards back one by one
until you find the bad one.
Re-seat all power and data cables
to HDD's. Reinstall 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