Why does the green light flash when I plug the power cord into our Dell Poweredge 840?

I shut down our Dell Poweredge 840 (from the OS) to connect a switch to allow use of the Poweredge 840 and another server with one monitor, keyboard etc.  After I got everything connected a green light was flashing followed by an amber light and the Poweredge 840 will no longer start up.  Pulled out the cables from the switch and reconnected as before. Same issue.
Please advise.  Thank you
PDSWSSAsked:
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Dr. KlahnPrincipal Software EngineerCommented:
Check the error lights (behind the bezel, on the I/O panel) against the LED error constellations in the manual.  One of these should match, and that indicates what the system thinks the problem is.
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PDSWSSAuthor Commented:
Both lights now green.

Message on Screen
RN50 A21 Bios
PCIE TRaining error:
Embedded Bus#00/Dev#1C/Func# 0


System Halted!    FLASHING

Any idea what this means?
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Seth SimmonsSr. Systems AdministratorCommented:
that means there is an issue with a PCI card installed
has any hardware changed?
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Dr. KlahnPrincipal Software EngineerCommented:
A PCI Express card ("PCIE TRaining error:") has failed, or the PCI Express bus controller has failed.

A quick Google search suggests that this is a common error in the 840.

One report indicates that failure of a RAID array as well as failure of the RAID controller can cause this issue, so pull the RAID controller completely and see if the problem disappears.  If so, swap in your cold-spare RAID controller.
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PDSWSSAuthor Commented:
DrKlahn:

Thanks for you input.  Appears that the error message that indicates Raid controller failure is a bit different-
Raid Controller error message says something about slot 1.
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PDSWSSAuthor Commented:
Called Dell, checked PCI cards. Removed one at a time including the RAID controller.  Issue remains.
Dell thought motherboard needed to be changed.

Although the issue was not solved both experts gave advice that was appropriate for this situation.
Therefore, will split the points.
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