How to repair power to a Dell 2950 Poweredge

We have 2 Dell Poweredge 2950 Servers both running MS Server 2003.  One is used as a PDC and the other as a Sequel Server.  We are trying to execute a planned shutdown for unrelated plant electrical repairs.  Last Friday morning we did a planned shutdown of both servers.  On Sunday (today) we tried to power up both servers.  When I attempted the power up on the PDC there was no power to that Server.  I check the electrical connections and the server are both connected to the UPS.  I switched the power to the servers and the PDC still does not light up.  The Sequel Server powers up fine.

Is there some sort of reset that needs to be executed on the PDC? If so, where?  I had a situation similar on a Dell server years ago that when the server was shut off for awhile the heat sync needed to be removed and reseated before it would power on but that is a faint memory.  Anybody heard of anything like that?  Does anyone have any other suggestions?
mikeplasticAsked:
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KorbusCommented:
I've often missed a "power override" switch, on the power supply itself.

Was the server physically moved?  If so, I would open it up and disconnect-reconnect power cables to the motherboard, as they might have been knocked loose.

I've seen bad memory actually prevent a dell PC (admittedly not a server) from booting up:  remove server components like memory and cards, and see if the system can power-up without them.

If that fails I would suspect you will need to replace the MB or power supply.  I HAVE indeed seen power-supplies fail during a power cycle.
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mikeplasticAuthor Commented:
Just a little clarification:  Please explain "I've often missed a "power override" switch, on the power supply itself."?
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rindiCommented:
Did you measure the outputs you get on the UPS? Maybe something went wrong there.
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mikeplasticAuthor Commented:
I took the two power cables that were plugged into the Sequel server and plugged them into the PDC and no lights came on and the system would not start.  I them re-plugged them into the Sequel server and all is OK.  I also plugged the two plugs that were originally in the PDC and pugged them into to the Sequel server and it started.
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KorbusCommented:
>>I've often missed a "power override" switch, on the power supply itself.

What I meant was double check the outside surface of the powersupply.  Sometimes they have their own, additional, power switch on them.  If this switch is off, the normal power button won't work (override).
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PowerEdgeTechIT ConsultantCommented:
What I meant was double check the outside surface of the powersupply.  Sometimes they have their own, additional, power switch on them.  If this switch is off, the normal power button won't work (override).
The 2950 has no such switch.

Test both PSU's ... when you plug them into power, does one of the green lights on the PSU light up?  or no lights?  What about the front  of the server ... lights or nothing?
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mikeplasticAuthor Commented:
No lights on PSU's - no lights on front of server.
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Seth SimmonsSr. Systems AdministratorCommented:
are you able to remove a psu from the sql server and put in the domain controller and see if just that one turns on?
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PowerEdgeTechIT ConsultantCommented:
Then your PSU's are probably damaged.  As seth suggested, take a known good PSU from the other one to test in it.  Worst case, you could used one PSU per system until you can get replacements.  A healthy PSU should at least acknowledge being plugged into power by lighting an LED, whether or not the system responds to it.
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mikeplasticAuthor Commented:
Worked well.
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