An i300? I had one of those. I'm not very technically adept, but... often my computer won't recognize my phone (currently i600) when I place it in the docking station. However, if I simply remove it from the dock and replace it again, that has worked--it sometimes took several removal/replacements to do that. That's true for both of those phones I've had. Secondly, try using a different USB port on your computer, if it has one.

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Keith
~ My karma ran over my dogma. ~