Iphone and Ipad not connecting to my computer?

Both my Iphone 4s and Ipad mini were bought this week. Trying to connect to my PC to sync my stuff. Neither are recognized by the computer and neither will charge. Doesn't show signs of any connection.
I have connected them to my wall charger and they work fine. I have connected my mouse and webcam to the same usb ports that I have tried and they both work.
Previously, I had a Itouch 4g on my itunes but lost it a few weeks ago. I have windows 7 home

Maybe its the cable, are you using the same cable to connect the devices to the computer as you would to the wall? In itunes (preferences -> devices) is "prevent itunes from syncing ipod, ipads, and iphones automatically" checked? Do the devices see your computer in home sharing? Try rebooting the machine and devices - (iphone, ipad i think you hold home and power at the same time for a couple seconds)

Bad usb connection? Try a diff usb port.

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