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However, best is reset the device. Try soft reset first, if not sufficient, try hard reset.
Soft reset : Hold mode and lap/reset for 10 seconds, then release. Hold start button then for 10 seconds, device should restart.
Hard reset : Hold mode and start button. 10seconds after, still holding them, pulse press lap/reset button, then release all. You should get a screen asking to confirm reset to factory settings. You'll loose all data by this, but device should restart with normal behavior.
The problem is probably not with the USB cable if the GPS wont even turn on. The older firmware of the Forerunner 205 and 305 have a problem with locking up. This causes the Forerunner to look completely dead. There is a reset procedure: push the mode and reset button at the same time and then let go and hit the power on button. If it powers on that is the problem. Go to the Garmin site and load the newest rev. of firmware into the Forerunner. Fixed mine and a few friends with the same problem.
I do however have a cable problem. Sometimes my PC will come up with unrecognized USB device and my 305 wont talk to the PC, it does charge. It is the cable or dock for sure, because I have tried a different cable/dock and the 305 has no problem. This is the reason I ended up here. I hope the lock fix works for those with the above problem.