Check the status in Safemode. Restart the computer and tap F8 at Dell logo. Select Safemode with networking and check the fan speed.
Refer the following link which has steps to resolve the issue:
Note: Plug your computer to a good, working UPS before you update the BIOS. If you experience a loss of AC power or a significant voltage sag/spike during the BIOS flash, you will either have to buy a new BIOS chip or buy a new motherboard.
Let me know the status.
running anything to monitor cpu/gpu temps?
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Not a dell rep, just a guy with a lot of Dell(s)