Sony Ericsson K750 / W800 / D750 / W700

Pliz i need help urgently i had logged my cel to the computer and i was fixing a photo i took with the cel and then without even closing the photo i disconnected the phone all the sudden and then the screen went black and i touched the buttons and it didn't work it turned off and on itself and a WHILE later asked me if i wanted the cel or the walkman and i chose the cel but it didn't show me the memory information so i turned it off and then i turned it on but it got stuck on the sony ericsson presentation part and no matter how many times i take the battery off (cuz it won't turn off) and turn it on again it get stucks in that part PLIZ I NEED HELP I REALLY NEED IT ☹️