So, to try to close the loop on this, it seems like the best solution was the one given in #10 above of installing from the current ISO. I was able to prove that installation worked on all 16...

An update and a possible clue.

The problem machine I installed via USB from the 20H2 download is up on 20H2 (19042.685). It shows no updates pending. It is working and I am typing on it. ...

OK, I am following your suggestion of downloading the latest W10 to USB and installing that on another of the 3 computers I am having trouble with.

In the mean time, I let the the "troublesome"...

It's the DVD I had. It's also (a copy of?) an official Del latitude DVD or at least one someone built that had the Dell extras on it already.

hsehestedt After letting it (install from CD) run overnight and completing the setup this morning, the machine is up on 1809 (17763.316). I was successfully able to restart etc. I'm going to install...

I've now gone through the 16 Dell E6420s from the non-profit:

1) It appears the date issue is another red-herring. There are machines built both before and after the machine(s) that don't work...

TL;DR:

Dell says the E6420 does NOT support W10. Is it possible that some of the early builds have some component (SATA controller???) that is incompatible with W10??? This is my best guess at...

OK. Next time I'll just post a link to the first thread.

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Hate to say it, but you seem to have posted the same thing it #14 and #15 ...

I realize this is an old post, but after much futzing around, I believe I got the sound working using the Audio_Realtek_W8_A06_Setup_RKKTF-ZPE.exe from the Dell website. (Google should find it.) ...

I realize this is a VERY old thread. I am posting what worked for me here in case someone else stumbles on this thread:

I have been having similar problems. As soon as I install the Windows8...

I have been having similar problems. As soon as I install the Windows8 Nvidia Drivers from Dell (Video_Nvidia_W74_A09_Setup_RRN66_ZPE) the XPS L502X system (which I am actually trying to fix for a...