I'm sorry friend but it sounds as if it is broken. The same thing happened to me. I got in touch with the Makers and they asked me to perform some checks and at the end of all this they said sorry but I need a new Router. So that is what I done. I couldn't afford one either so I got a new one on Ebay for
about £12.50 and they cost £59.95 in PC World. Try that and hope you get some luck, Regards.