Being set in RAID is probably why the system boots slowly. With one drive not a problem but that second drive is what started it all and in RAID the system is looking for the required drivers needed for RAID. And SSDs run better in AHCI. Trying to change to AHCI would mean reinstalling Windows 10. But the following procedure may help out. If you are not comfortable making the following change then reinstalling Windows with AHCI turned on may be the best solution.
Have you tried it with Secure Boot turned off? Sounds like the second drive is causing the BIOS to hang up during POST. Try tapping F12 when you see the Dell splash screen. Then select the M.2 drive from the list which will force booting from the M.2 drive. If it boots faster then you can figure that the boot order or boot configuration is possibly suspect during boot.
I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop
JOcean
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Posted October 23rd, 2018 02:00
Being set in RAID is probably why the system boots slowly. With one drive not a problem but that second drive is what started it all and in RAID the system is looking for the required drivers needed for RAID. And SSDs run better in AHCI. Trying to change to AHCI would mean reinstalling Windows 10. But the following procedure may help out. If you are not comfortable making the following change then reinstalling Windows with AHCI turned on may be the best solution.
https://triplescomputers.com/blog/uncategorized/solution-switch-windows-10-from-raidide-to-ahci-operation/
also
http://triplescomputers.com/blog/uncategorized/solution-switch-windows-10-from-raidide-to-ahci-operation/
I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop