HPS Ballast buzzing, no light

Hey, I have a problem with my HPS. I had to turn it off today, unscheduled, and when I came back and tried to turn it back on, it just makes a buzzing sound, no light comes from the bulb. The ballast just buzzes and nothing happens... does anyone know what could be causing this? I'm about to put my girls into flowering and this is something I really didn't need right now, totally disrupting my plans

Thanks in advance!

check the wiring. One of the wires are prob not connected right.

Yeah, it probably is a simple fix, at least you know the ballast is working. Try another bulb for starters...