That's a good sign, the 507 indicates there's no OS. Try rebooting your PC and installing the OS again. Also, make sure you're using a USB port on the PC and not a USB hub.
The difference between stupidity and genius is that genius has its limits.
When you take things for granted, the things you are granted, get taken.
Even a mosquito doesn't get a pat on the back until it starts to work.
Too many people miss the silver lining because they're expecting gold.
[BES 5.0.3 / GroupWise 2012 HP2]