MSA 60 Tone When Powered up

I picked up an MSA 60 as a cheap backup target.   When I power it up, it just emits a high pitched tone, like a bios error, that doesn't stop.    The seller says this is normal, but I have some other MSA models and none of them do this.

Does anyone have experience with these units and can tell me if you just hook up power (no SAS cables) does it emit a tone?

Thanks