[Sting32]

There is a setting in the stock roms to not charge the phone if it is turned on, I know dang well it is in there, can I find it right now, nope.

Another option could be that you told the phone to connect as a USB thumbdrive device in the settings/all settings/usb to pc setting screen? lastly you can ruin cables (especially cheapie ones) so in all the other PC's were they all with the same cable?