[Closed] Cheap chineese light problem, Help needed Pls

Im looking for some help from a light expert,

I recently purchase one of those cheap 1200lumen magicshine type copies from ebay to go on my commuter bike but it appears to have developed a problem.

When I connect the (charged) battery, the green light switch comes on as normal but when I switch it on the light flashes once and goes out as does the green switch on the rear. Clicking the switch again has no effect and green light stays off.

Any ideas what is causing the problem and is it an easy fix?

I know I shouldn't have bought a cheap piece of crap from ebay but it was only for the commuter so didnt wanna spend alot. Unfortunatly now it has just passed 3 months old the seller wants nothing to do with helping Grr!

Thanks
Russ