Hi Jnkn & Welcome to the forums ^_^,
On making the WinDBG analyse the first dump file, I was told the below -
Let's check the stack -
This is typically due to a hardware malfunction. The hardware supplier should
Filled with HAL and WHEA and add to the fact that you are having problems with the screen since BIOS screen. I would say this is Hardware Problem. I would suggest you to send this back to Dell for repairs as keeping on diagnosing this further would only cause delay.
0: kd> k
8223eee8 82031465 nt!KeBugCheckEx
8223ef18 821c5bc1 hal!HalBugCheckSystem+0x6d
8223ef44 82031f60 nt!WheaReportHwError+0x1e6
8223ef58 821735c4 hal!HalHandleNMI+0xea
8223ef58 8201a6bf nt!KiTrap02+0x15c
8223f01c 82174539 hal!READ_PORT_UCHAR+0x7
8223f01c 00000000 nt!KiTrap07+0xe5
Let me know how it goes ^_^.