I recently purchased the Supermicro 12 Bay LFF Server X9DRi-F 2x Xeon E5-2650 16 Core 32GB HW RAID 2PS, but immediately after I turned it on there is a single (1) very loud beep that never stops and all the drive bays lights go red for a few seconds. The screen shows a post, but the loud beeps continues making the system unusable.
Does anyone knows the problem and how to fix it?

Is there a keyboard plugged in?

Check your power supplies.  If both are plugged into the backplane, they both have to have power.

@StevenDGoing to try this, because I have both in, but only one plugged in.

Thanks

Sounds like an unplugged power supply to me.

You guys were right, I had both PSUs installed, but only one with power. Removed the extra power supply and it's now working.

Thanks for the help.