Hello.
I had the same exact problem.
After extensive research, I managed to fix it.
Here's what I did...
-Power ON the computer.
- After the Dell logo, when the screen goes black, Power OFF.
-Then, Power ON again and Press F2 to get into the BIOS.
-When you are in the Bios, Go to the "BOOT" menu.
-Then go to "SECURE BOOT" and select "DISABLED"
-Then go to "ADD BOOT OPTION" and press "Enter"
- In the new window that opens up, go to "BOOT OPTION NAME", and type "CD/DVD/CD-RW Drive" without the quotes.
- Tab down to "YES" and Press Enter
- Now, you should see "CD/DVD/CD-RW Drive" in the list under "BOOT PRIORITY ORDER and UEFI BOOT.
- Press the "+" key to move "CD/DVD/CD-RW Drive" to the top of the boot list.
-Press F10 to Save Changes and Exit.
Your computer should now boot normally from now on.
It worked for me.