Google Product Forums
Re: Samsung Galaxy Ace does not connect to PC neither with USB mass storage nor KIES
Feb 22, 2012 5:36 AM
Posted in group:
Google Mobile Help Forum
Other Google Products
Are you using a laptop or a desktop computer?
Regardless, try another USB port, and if it's a desktop try with one on the back.
Could be lack of power in the front ports or when using a USB-hub.
Give it a shot and post back any results.