iphone 3g yellow triangle

[bblazek]

Hi guys,
i'm having a problem with my 3g, every time i connect it to charge it gives me this sign, i looked everyone and could not find what it means, please help me

 

[HellDiverUK]

Danger, danger, high voltage!

Have you tried a different charger? Does it charge off USB?

 

[bblazek]

yes, i tried different usb cable, wall charger, i even tried to change the battery and powerdock for charging