I have a Dell 5820T with AVAGO MegaRAID SAS-MFI RAID controller. 4 disk configured in RAID 10. When the tower was powered off I pulled out a drive and started the computer, Windows 10 loaded with no issues but the computer won't stop beeping. I did shut it off and place the 4th drive back but the beeping won't stop.

Looking at the beep pattern found here,this is either a 1-1-1 (not found in the table) or 3-3-3 (RTC/Keyboard controller not found) issue, my keyboard works fine. I did try removing, and re-adding the controller, no luck. I tried accessing it from F12, no luck, it's not showing up. While Windows boots, all space is available and neither BIOS/UEFI nor Windows is showing any error just the constant beeping is driving my crazy.  If I remove the RAID controller the beep does cease but I also have no hard drives

Does anyone have an idea:

• how to stop the beeping?
• how to change RAID configuration?

Thank you!