Here's what happened:
I was being continually bugged by my friends to root and then install a custom rom on my tipo. They kept taking about how wonderful it would be and all that. so i went ahead and successfully rooted my phone. Then i installed Clockwork mod 6 and took back up of my current rom on the external SD card. Then i backed up the clockwork mod folder containing my backup on to the pc.
Then i downloaded PACman Rom complete with gapps.zip and fixstorage.zip. and loaded them in sd card and then booted in to cwm and flashed the rom. I got the finished message and rebooted but got stuck at the sony icon and would go no further. i then decided to go back to the orignal backup i had taken. i again booted in to cwm and tried the back up it said md5 mismatched. i googled it and came up with procedure to fix error using SDK tool and managed to remove the old nanadriod.md5 and write a new nandroid.md5 in the backup which fixed the md5 mis match error.
I again started the recovery from backup and got past md5 mismatch error, it loaded boot.img successfully and got stuck at loading the system file.
i tried several times but still the same. then i tried rebooting to try it again and i cannot go into cwm again. and neither can it boot up because the system image didnot load fully. it doent even show the orignal bootmenu before rooting. i am stuck and dont know what to do. please help.