Originally Posted by rayhipkiss
If you still can't connect to Kies, you may as well flash your phone manually using Odin and download the firmware from SamMobile Firmware Page
You can also download Odin from the same site.
I had a similar problem to you except my phone would say connecting... Then say Unable to gather information from GT-i9000.
Ray helped me out, and that method above ^^^ worked perfectly first go, I suggest doing that. Kies sucks, and the above method is very easy and probably better then Kies.