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1. pull out the bulbs, flip it around and put it back in firmly.
2. Check to see if your ballast has a fuse, if it does see if the fuse is blown.
3. With the fixture unplugged, take apart the ballast box and inspect for any signs of damage. Sometimes the capacitor goes out and those are usually only $20-40 to replace.
4. Take the fixture to a friend or LFS and try to double check the ballast and bulb with some used components they may have.

Good luck and be careful
 

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Remeber, do not touch the bare bulb with your fingers... the oils in your hands will rapidly diminish the life of the bulb if not cause it to blow immediately once turned on.
This simply isnt true. I handle all manner of SE and DE bulbs with my bare very frequently and I have never had any of them blow. Sure I take care to wipe down the bulbs after handling them but the notion that a minute amount of oil will cause severe damage to a halide bulb is overblown.
 
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