Memory Full???

Hi People!!
Again i could do with any help from any kind guys out there!!!
I have a 7650 which when i received the "low memory,please delete some data"message,a mate used it to take another photo!
Now when i power the phone up i get the message "memory full"(white screen) and cannot enter any feature(pressing any button causes the phone to turn off)
I cant delete any data as cannot power phone up that far!
i can only think of connecting the phone to the pc and removing some data that way....
I do have a data lead and a back removal tool,but cannot work out how to remove the "keyboard tape connection"
Any suggestions please???Even to totally delete/reset phone
Thanks people for any help!!!
Terry