my sony w810i displays flashing white light?

my sony ericson w810i displays white light whenever i open it. it stays like that for a few seconds and then turns off. so in short i can't use it. is the problem due to a corrupt software on the phone or is it just merely on the ribbons? I actually have bought and installed brand new ribbon (the one connected to the camera and to the circuit board) but the result is still thesame. can anyone help me how to fix it?