I discovered another discussion about this issue at Dell.com. A guy named JohnD said, " Solution: Try turning off "Fast startup". There have been issues
in the past with "fast startup".
- You can find it in "Settings" > "System" > "Power and sleep" > "Additional power settings".
- Click the "Choose what the power buttons do" on the left menu list.
- Click on "Change settings that are currently available" link.
- Uncheck "Turn on fast startup" and save.
Your system will now do a complete shutdown when you shut it down, It will take a little longer when you boot up, but it wont be much unless you have a very
old computer. JohnD"
It has baffled me for months as to why after this update, my computer will not start after a regular shutdown, but will start fine after I turn it off with
the power button, so this answer made sense to me, especially after I looked up "fast startup" online.
I have my windows updates paused, but on Friday, I installed a critical update from Dell Update listed as ""Intel Management Engine Components Installer," which caused the same boot problem. I tried JohnD's suggestion,
and my computer will now start normally when I press the power button after a shutdown. It still will not start properly if it is on "sleep" too long and shuts down itself, so I am guessing I am still missing something somewhere, but this is progress.