Need help 1000w mh bulb not working

Hello, so i recently bought a 1000w ballast that works with MH and HPS Bulbs with a aircooled refleector and I was currently using the MH bulb for about 3 days and then last night i turned it off for the night and in the morning when we went to go and turn it on again it just barely starts to flicker onand then flickers out and turns off iv keep trying over and over again, i have also tried my HPS bulb and it works perfect... This is a link to my set up http://www.ebay.ca/itm/271044675175?var=570109854631&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 .... we have tried a few things and nothing works, is this just a faulty bulb or do i have my set up right? why is this happening? please help i need my babies back under this light asap! The reason i think this is not a faulty bulb is because it was working fine the last 3 days and then this morning is the first time its dont this so im really confused. ANY help or suggestions would be great.

Here is a video link to the bulb not working: http://www.youtube.com/watch?v=jTtmqtYi6HU
Thanks people.

It looks like a faulty bulb, especially since your hps is working. Contact the seller and get a replacement. As for your current crop, use your hps bulb. Ofcouse mh is optimal for veg., but hps will work fine atleast until you get a new mh bulb.
Happy Growing.