A class Immobiliser issue

[mneylan123]

Hi there

I have a 2003 A Class 1.6 avantgarde. Been really great until i left work today, used the keyfob to unlock but no response. I changed batteries but no good. I unlocked the door manually and the alarm went off, I disconnected the fuse for it. The key turns and lights appear but doesnt tick or crank over. Tries disconnecting and reconnecting the battery and also checked the necessary fuses but no good. Any ideas if its keyfob, starter, ignition, alarm or immobiliser related.

Any help would be great

Regards

Mark