My Kenwood SB300 Smothie maker blade won't whizz around

I received this Smoothie maker as a present in Christmas 07 but did not use it till Autumn 08. I use it about once a wk. This morning I added frozen fruit, they were all broken up as per manual but nothing happened. There was noise but when I emptied back out the fruit, I could see the blade was not turning. I plugged out the machine and turned the glass container upside down to tighten the bolt underneath the blade but I could not seem to tighten it, as bolt was very loose. Any help would be much appreciated as I have only used the Smoothie maker for a few months. I am living in Cork, Ireland. If you direct me tot he nearest help centre