99/T Cuore not starting!!!

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Hi, got a problem with my 99 cuore. When i turn the key, it's like it starts for two seconds and then dies. Has anyone experienced this? know what the problem may be. I think it may be the key imobiliser, is there any way to fix this (or is it dealer only), any help appreciated - frustrated cuore owner!!!!!

P.S. the car was left parked for about six months whilst i was abroad - and it hasn't started since - been 2 weeks. The battery was flat but i've changed that and i've got the main grey key.