I had this problem when i ran over my eGo T with a piece of heavy equipment. I took the top off because I didn't think I could lose anyway and found that the PC board had fallen out of its slot. Hard repair with a 1" wire connecting it to the battery, but once I put it where it belongs, my troubles were fixed. Still use that battery. There is a site that sells replacement boards with buttons and wire but I can't for the life of me find it right now. 
EDIT: Found it! http://www.shop.goodprophets.com/product.sc?productId=236
And a video: http://www.youtube.com/watch?v=nKmIPlsrj3M
EDIT: Found it! http://www.shop.goodprophets.com/product.sc?productId=236
And a video: http://www.youtube.com/watch?v=nKmIPlsrj3M
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