J.B.
Did you just update it? If so, that is most likely the problem. It may have killed it. Unfortunately that has happened on some phones with the iOS7.
Like some have said get it to an Apple store.
It was fine last night. I left it charging at night and upon waking my iPhone wouldn’t start. Black screen, no charging logo after pressing the power button. I wondered if the charger wasn’t working, so I used another one, a second identical charger, and then finally an iPad charger. Nothing changed. I tried pressing the power button for 5, 10, 20, 30 seconds and nothing. I did the same with both buttons (Home and Power). I tried to get it into DFU mode and nothing. The computer does not recognize it, iTunes either. Then, by tightening the buttons frantically (connected to de USB port of the computer), appeared for a split second the charging logo, saying it had no charge.
I researched the internet and no solution was applied to my case.
EDIT: Sometimes when I disconnect the iPhone symbol (No charge symbol) appears
Did you just update it? If so, that is most likely the problem. It may have killed it. Unfortunately that has happened on some phones with the iOS7.
Like some have said get it to an Apple store.
Call AT&T and ask them or take it into their store or kiosk.
I would take it to an Apple Store.
Try pressing the home and power buttons simultaneously for awhile, maybe 10 seconds or so? It's weird but has worked for me before.
I would take it to the ATT or Apple store.
However, something similar to this did happen with my husband's IPhone and he took it to the repair place that does repairs for us. We are aware an outside source repairing the IPHone voids the warranty but hubby has dropped his and cracked the screen about 3 times and this guy who is located on the other side of the building from the ATT store fixes them for about $75. Even the ATT people send customers to him for repairs.
Anyway, the last time, when this happened, the repair guy replaced the battery and it has worked great ever since. Again, less than $100 to repair.
I would take it to Apple and not ATT. ATT wanted to charge me $40 for shipping when Apple looked at it right there.
the no charge symbol, actually means your not using an Apple approved charging device (cord), it will still charge though. For it not working at all is a mystery. Definitely take it to Apple and see if they can give you a solution. Don't forget to make an appointment before you walk in the door. LOL it is crazy.