I am glad that you could finally get to the BIOS settings and also discovered your OS drive. With RAID setup, the SATA drives will be working as unconfigure and does not impact any performance.  However, the current boot time for your machine is not acceptable.  It can be complete boot time in 15 seconds or less. Let try to change SATA operation mode to AHCI first.  You must follow the procedure below or else your system will BSOD (blue screen). Run elevated cmd as administrator  Copy and paste or type this command, which will start Windows in Safe Mode the next time you reboot: Reboot the computer and enter BIOS setup. Change the SATA operation mode from RAID to AHCI. Save changes and exit Setup and Windows will automatically boot to Safe Mode. Click on Start and type cmd and select run as administrator, as in step 1. Copy and paste or type this command, which will start Windows in Normal Mode the next time you reboot: Reboot and Windows will automatically start with AHCI drivers enabled. If you choose to reinstall Windows 11 pro from USB created by Microsoft Creation Tool, you will need to run an inventory of your system applications to see if you have all resources for reinstallation.  Then make certain that you do have all your important data backup.  Run export your browsers bookmarks.  Finally, review this tutorial for how to clean install Windows 11 from USB to familiarize yourself of what to expect. I just response everything in general, if anything is unclear, just let me know.
OK, here goes. My XPS8930 has been taking forever to boot up. Lots of power outages here in TN. The computer no longer booted up again when power was restored. I previously had this set in BIOS a long time ago. So I erroneously figured I should reinstall Windows11 pro to spruce things up. Made the bootable USB according to Microsoft. Turned on the power and pressed F12 like a lab rat. Nothing. Just booted to Windows. Tried F2. Nothing. I made the USB with windows creation tool and with Rufus. USB is 32GB. Went to Dell support page and saw critical update for BIOS 1.1.30 is due. I’m on 1.1.28. The minute I click on the downloaded BIOS file my computer crashes and restarts. The BIOS isn’t updated. I tried doing the BIOS recovery from the USB. The HD has been replaced and doesn’t have the BIOS recovery on it. No go. I even put the BIOS update on the USB and changed name to the BIOS_IMG.rcv. All that did was cause the computer to shut down quickly like it did before. So basically, I can’t get into BIOS using wired keyboard and I can’t get into BIOS recovery with USB (BIOS_IMG.rcv) and pressing CTR and ESC. I’ve removed the battery and unplugged the power cord as well. Still no change when attempt the boot up. Never see the Dell logo screen. Just black until I see the windows log-in page. I disabled fast startup option per a youtube video. Slowed it down alright but never got into BIOS. I’m assuming the BIOS/motherboard is corrupted. Windows works perfectly. Just can’t get into BIOS. Any more ideas before I start searching for a new computer? Just put in a new battery. No difference. Thanks.
XPS 8930, can't boot into BIOS