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Hi i dropped my iphone 4 and the front screen has got few dark spots and the phone is not switching on. I tried to connect it to the charger but dint turn up. Later on i opened the phone and saw that the link between the Battery and the connecter (thin chord) has broken off. Please suggest me something.

sandeep, sounds like you are talking about the battery cable. You replace that with a new battery. When you replace the battery, it should also turn back on. The “few dark spots” is most likely a broken LCD. Replace the display assembly to fix that. All the guides to repair your phone can be found right here. Hope this helps, good luck.