Ok so they replaced the ram sticks, and also replaced the ssd pcei hard drive. Everything working now. That includes all ram sticks. So the  1-16gb and 2-8 gb. Guessing here when the inaccessible boot device blue screen was showing up there was a problem with the hard drive. Either had to reformat windows or get new drive. Technician said he seen it happen a few times because windows 11 does something when you replace the motherboard. But everything seems to be running again.
I purchased an Alienware Aurora R12 desktop about 1 year ago. I just recently bought a 16gb ram stick to upgrade my computer. Put it in, computer wont start. Take it out computer wont start. Take out the 2 8gb ram sticks try with the one. Works. Contact Dell. They say faulty motherboard. Send technician, install new motherboard. Still doesn't work. Technician LEAVES me without a working computer. 1 week later. Another technician shows up. Installs new motherboard and power supply. Still wont run with multiple ram sticks installed, but at least turns on. While working on the computer he gets on the phone with another Dell employee tells me they will send a refurbished computer to me. Ok great, leaves. Turn on computer get a stop code. Inaccessible boot device. Call Dell again. Faulty motherboard again. Ask him about them sending another computer. No, wont do that unless its your 3rd major issue. I payed big dollars for this computer and I'm getting refurbished parts? How.. why.. what is going on? I cant believe the technicians leaving without even testing the computer.
Aurora R12, ram upgrade, what is going on?