Dell T7400 Workstation Hyper Fan

I have a Dell T7400 Workstation running Windows XP x64 and Bios A09.  For some reason about 1 minute into a power-up, the fan starts getting progressively faster until it sounds like an aircraft is approaching.  Does anyone know what the problem could be?  The issue began after I disconnected the SAS controller and drives (physically removing the devices), and then installing a SCSI adapter and drive.  The system boots fine and goes into Windows without any error messages.  It's just that the fan is extremely fast.
Thanks in advance.
LOUIS-RUOCCOAsked:
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LOUIS-RUOCCOAuthor Commented:
Thanks for the advice.  In my case, the issue was resolved by replacing the side panel.  I know!  I was upgrading several components and had the side panel off for convenience.  This is not recommended for safety reasons.  Replacing the panel resolved the issue.
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nobusCommented:
you can check the bios settings if there is a fan setting to adjust
or reset the bios
or check for a bios upgrade  http://www.dell.com/support/drivers/us/en/19/DriverDetails/DriverFileFormats?DriverId=R304939
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nobusCommented:
that's the first time i hear thjat..but there always is a first time - yes?
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DavidPresidentCommented:
I have a T7400 a few feet from me, and know exactly what you are talking about.  
 - If case is not closed properly then it will get loud (but give me a break, if you think THAT is bad, you've lived a sheltered life ')

Since it takes about a minute to ramp up, then it is overheating.  A BIOS setting or microswitch failure isn't going to help. The system is running loud because it now has to.

Get a shopvac, take it outside and clean the fans, insides, etc.  Your enemy is heat. Dirt and dust are locking the heat in and decreasing efficiency of the fans (don't forget internal fans on CPUs and within the case)
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LOUIS-RUOCCOAuthor Commented:
After trial and error, I evetually resolved the issue.  The others solutions did not work in my case.
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