The parts came in, a motherboard, chassis fan, & fan for cpu. The tech just dropped them off like I requested. He didn't have time to do the repair himself with a backlog of customers, and I preferred to do the repair myself anyway. I didn't use the fans, mine are still good. I carefully torn my pc down, and reinstalled with the new motherboard. I went straight into the bios when I booted up, added service tag number, corrected a few entries, then on to my dual boot option. Chose Win 11 Pro because that one has my main EFI system partition. Had to enter password to log on as pin no longer works. You have to delete old pin, then enter a new pin number on both windows & both office systems in order to use pin. Anyway, I finally got around to shutting down the system. Guess What?? It shut down like it's suppose to...no more fan noise!! The MOTHERBOARD fixed my problem...first time it's shutdown  properly since arriving here from Dell Outlet!  MY REJECT IS FIXED!!!!!
XPS 8940, CPU & Motherboard (Chassis) fans run full speed when Desktop is shut down, quiet on Startup & while running. Have to pull the power cord to completely shut the computer down. It was doing the same thing on Sleep & Hibernate until I disabled those functions. Is this common on the 8940's? Never did that on my Inspiron 530 & 660. So I let the computer run 24/7 and have no problems. Shouldn't have to do that. I read on the forums that a lot of people are having the same problem on their 8940. Spent over 2 hours on phone with tech support, they finally gave up and said my time had expired! It's definitely an engineering problem as far as I can tell. I think it could be the power supply or motherboard, or something is not quite right in the BIOS. Running the latest 2.3.0. Running i7 11700, 32gb ram, 1660ti graphics,  NVMe 512gb,870 EVO, and Dual boot win 10 Pro & Win 11 Pro. Problems with the fans running full speed started the day I first received it from Dell Outlet...probably the reason it was there in the first place. Anyone have any good solutions??
XPS 8940, fans run full speed when shut down, quiet when running