ballast wiring

[Invigor]

this is a pfo 250w x2 hqi ballast, I might have oops'd on the rewiring different plugs onto it but I'm not sure..when I turn the ballast on the bulb lights up glows for about a minute, then shuts off before really firing up

what do you think is the problem? bad wiring or bad bulb? I thought maybe the cord was too long so I shortened it to 4'..didn't help any.

Thanks