E31 - Front FAN at full speed after bios update !!

Hello,
we have a Thinkstation E31 (2555-22G), and today after the Bios update with the Lenovo system update tool the front Fan (near the SATA connectors) is at full speed constantly. it is just impossible to stay in front of this computer because of the noise, i had to disconnect the fan.
I tried to flash to an older version available on the site but it doesn't change anything.
I tried to reset the BIOS to default, and also removed the battery from the motherboard.
I found in a faq but for another model to remove the power cable and press the start button during 10 seconds.
I didn't find something working, there is no fan control setting in the bios, or it is well hidden...
What can i do ??
Thanks for your help.

The beeps you're hearing are part of the CMOS clear process, so they are normal.  Once you hear the beeps, you should be OK to shut it down again.
I'm not necessarily convinced a bad fan is the cause of the issue if you truly only experienced the higher fan speed after a BIOS update.  But I also don't want to work on the same issue from two angles/paths at the same time....so I'm going to say let's wait and see what happens with the service route first and go from there.
If you happen to try it again or see the message again...I'm curious what error codes you're seeing after the system starts and you get the two POST beeps.  A message about corrupted settings sounds like it could be important  A picture might be helpful here if you can capture one.

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