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I found that switching the device on and/or off while connected to the computer can leave the screen blank, and won't give any sign of life when the ON/OFF button is pressed. In reality the device is on and the batteries will drain. Try a RESET in that case by pressing ON/OFF and MODE buttons, and briefly pressing the LAP button.
If you have the time and patience then log onto garmin and download the webupdater then join the garmin site and plug in your 305 garmin dashboard will update for you and possibly fix it, other than that you will have to send it to garmin, if its still in warranty, 75 dollars if its out of warranty
This might just need a reset. To reset the Forerunner or Edge 205/305:
Connect the device to the computer using the USB cable
Press and hold the mode and reset (lap) buttons together for 10 seconds
Release and wait for 3 seconds
There should be some indication of battery charging (either Finished or In Process)
Power the device on while keeping it connected to the computer
addition, please make sure that the device has the latest software
version available by downloading and running the WebUpdater program. To
update the software, please use the following link: http://www.garmin.com/products/webupdater/
Pairing the Edge 305 and sensors
Once you have installed the Garmin Edge 305 and the
cadence sensor they need to be paired. As they communicate wirelessly
with each other the Edge needs to connect to each sensor before it can
receive input from it.
The initial pairing needs to be done away from other
wireless systems this allows the Edge to pick up the sensors it is
supposed to be monitoring. This is a little like black magic, but it
seems to work quite easily.
The cadence sensor has a small press contact which puts the sensor into pairing mode. The HRM just seemed to connect by itself.
Subsequent pairing is much faster as the Edge 305 seems
to remember which sensors it is paired with. If you have problems or
need to change one of the sensors then you can use a setup feature to
either turn the sensor off or to re-pair it.