Need help! Light went out!

Woke up this morning and my hortilux hps conversion bulb is out. THe ballast is running but the light is just buzzing. Its all been working fin the last week but when the lights went out last night. THey never came back on. Please help. Is the bulb messed up? THis is my first grow with these bulbs. thanks.

Well I messed with the plugs and took it off the timer and its working now but my timer was on. Weird

mate,,,it could've been your timer,,is it an electronic one or mechanical,,cos the elec ones wont last long on a hps light cos they pull too much power for them to handle at the start

Mechanical, I think its because it dosnt have a real ground. just a hole there. My buddy gave it to me and I didnt realize he just cut a hole for the ground to go into. Gotta get a new one. Thanks though.