I have three ipod 4th gen and the latest version of itunes has killed them all

can anyone help?

I have had to open the ipods reformat on a pc and reassemle

then the pc will see the ipod and itunes offers to restore.

I pick restore then it says connect to a power source to complete the update

I left it for a day and it still has the connect to power socket picture on the ipod screen

these were all working ipods until version 11 itunes

any help greatly appreciated