APPLE IPHONE 4 BLACK 16BG FAULTY ?

iphone 4 16gb black boxed the fault with the phone it will only switch on when plugged in the wall i dont know what the problem is as i dont repair phones and it as just been sat on the side for the last couple of months so just want to get rid the phone is on 3 and is in good condition cosmectically It is boxed but no charger as i use that for my 4s iPhone 4s 16gb Brand new never been used Still sealed in box O2 network Call/ text for more info 07756450475 Apple iPhone 4S 16GB White Unlocked Apple warranty until 7th November 2012. Handset itself is only around 3 weeks old as it got swapped over recently. Handset is in perfect condition, has always had a screen protector and case. Comes complete with box, charger & dock conector cable. If you have any questions please do not hesitate to contact me. Hey, Selling my iphone 3G : - good condition - no box - with charger - only text message why pay 80-90 for copies on gumtree when u can get A++++ copies for 65 A++++ sound quality A++++ quality copies you cant even tell difference cash on collection can be tested before purchase u cant be scammed thanks