@Soumyam...Calm down man...u need to learn to live life abit less seriously, just because a HDMI feature doesn't work doesn't mean you have to bring the whole house down. It doesn't matter if you see any point in my comments or not, because really this is Sony Ericsson's discussion board, not yours.
@Macky and Yohan...Friends the HDMI works for me when I plug it into my HDTV. In addition, it also works when I plug it straight into my Acer Aspire Laptop which supports the latest HDMI functionality.
I could only suggest to repair your software using PC Companion or Sony Ericsson Update Service. HOWEVER, since the 2.3.4 update is just around the corner, it would be beneficial to wait for it and while updating the software as well as the HDMI scripts. :)
Hope that helps,