Originally Posted by nashfh
Creative, but didn't work. The battery needs to be in.
Just to clarify, try plugging into the PC with the battery installed, then pull it while still hooked up. Does it immediately shut down or stay in some form of a powered state? If the latter, wait a few seconds and reinstall the battery. It's an old blackberry trick for boot/OS install problems. Not sure if it applies to these phones or not.
If that all still fails, it'd be nice to see if a different battery made a difference. Did they try that at the store?