long beep when setting up a new puter

[ChrisIsBored]

Hey guys i'm trying to figure out what the problem could be here, just setup a new system but having a little problem. It boots up fine, gets past the vid card, into the scsi RAID screen.. and then just gives me one long beep.. that's when I turn it off so nothing gets damaged. I'm going to try taking a few things out and try again, anyone have an idea what might be wrong?

 

[Shack70]

What hardware is in your system? What OS?