please help??? no display

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hi, my display has gone off on my xperia x10 the backlight still lights and keys still light up, but thats all i get, the phone loads and i can still recieve messages and phone calls because i can hear the notifications, i have taken this to a shop who said it was the lcd, so they replaced it, but the phone is still the same, im not covered on warranty because i bought it privatly, i also wondered if anyone knows, when you take th back cover off directly underneath the battery underneath the two screws at the bottom of the phone, something that looks like a long clip in thing, wot function this has on the phone because right at the bottom of mine the plastic has come away abit and i can see gold metal. thanks in advance for any help. also have have done a repair on pc companion and its made no difference,