Hold the power button down for 10-30 seconds, until it powers down. it should be fine as it hasn't started the update process yet. In the worst case, Dells have a good BIOS recovery function.

are you able to power down and observer the same stuck issue when power up again?  this looks worrisome.  I would power down, disconnect power cord, press power button to drain power, replace cmos battery and clear cmos settings if possible.  you see this screen would occur if you had run a bios update before.  It then restarts and try to flash but fails.  a failed flash can brick motherboard.  I would try to abort the flash process.  do not let it start on its own.  for whatever reason this pc is not good for bios flash.

Please try performing a Hard Reset: 1. Disconnect any external devices including the AC adapter (and battery if possible) 2. Hold the power button down for 20~30 seconds 3. Bypass any power strips, surge protectors or battery backups 4. Verify the wall outlet is functional 5. Plug only the AC adapter/battery back into the laptop 6. Attempt to power on the system and finish the update. If that does not solved the issue, proceed to the next step. 1. Remove the AC adaptor and wait for the battery to drain completely (it can take minutes or hours depending on the battery level). 2. After the battery drained completely, connect the AC adapter back and press the Power button for 25 to 40 seconds until the battery charging LED blinks twice and then the release power button.  3. Once that is done, check if the update was complete and you have the new BIOS installed.

Hi @Sugarmoose, thank you for the details. Can private message us the service tag of the system along with the BIOS version the Support Assist was trying to install? -Akshatha

According to support suggestions, I followed the procedure listed specific to my case (BIOS 1.10.2), and this solved the problem. .

Hi @wlod welcome to this free user to user Alienware laptop discussion forum. This is not Dell Support.  Guess that BIOS update is being installed over the internet. It will now be permanently stuck, and only option is to briefly press power-on button for system to correctly slowly shut down. If power-on button held down, it will force unwanted rapid shut down. But system might only accept forced shut down.  Only if BIOS update essential to get new user feature, open local admin account and download file onto your Alienware m15 R3. To ensure the integrity of your download, please verify the checksum value. Of all the Dell updates, the BIOS update must be undertaken as described within its Installation instructions.  How to incrementally update the BIOS on your Alienware PC - YouTube  [This user does not work for Dell and volunteers their free time. Please remember to say thank you by clicking on Kudos as this user's only reward.]

Still doing it??

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@ballistic2 So many post about problems with both. I just prefer manually installing updates. If you know where your Driver Support page is then use it. Regards, U2