It sounds exactly like the boot up beep except it happens in bursts over and over while it says it's reading my USB, I can't tell if I'm stuck in this screen because I'm not letting this PC beep long enough to find out.
I attached a photo of what I'm getting.
My specs are
Msi 760GM-p34(fx)
Fx 8350 (yeah I know it's too powerful for the board, I'm trying to undervolt it so it can handle it. That's how I got here)
Sapphire r9 280 3gb
Hyper 212 evo
1tb hdd
Seasonic 600w psu
Also if anyone knows how long it takes to boot from a usb lemme know, I left for a couple of minutes before I got sick of the beeps and got nowhere.