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These units seem to be suffering from a bad connection on the inside of the unit. My wife's did the same thing. There was a connection inside that wasn't making contact. First try cleaning the 4 brass connection tabs on the watch and check your charger to make sure the tabs are raised and not squished. Second try to reset the unit. Hit mode reset and power buttons all at the same time. Hold these for 3 seconds and then release. If these do not work here is what I did. There are no screws holding the unit together. I used a exacto blade to very carefully pry the unit apart along the side seam. It's not easy to do. Be very cautious and gentle. Work the thickness of the blade into the joint to gently wedge apart. You are not trying to remove material! Once apart you will see some fingers that make a connection between the upper and lower part of the unit. This is where the problem was with my wife's 305. I gently raised these tabs to make a better connection, It's been working ever since. I didn't try it before but try pressing very hard on the unit where it says Forerunner 305. The case is very hard so it might not work. But if it powers up when pushing you found your problem. Hope this helps. Here is a link I found on opening a 205 (Same process) http://ctorunner.googlepages.com/dismantleforerunner205 To put the unit back together use Automotive silicon/gasket maker. Use a tooth pick to put a VERY small amount of silicon around the entire seam. Put the two half's together and wrap tightly with electrical tape. Test the unit immediately to see if it powers on and off. If it does not open it back up and raise the small prongs that make the connection from the bottom half to the top half. If any silicon squishes out the sides wipe with water and a rag. Let the unit sit over night. In the morning remove the tape.
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whoa, mine just starting doing that too. Today on a run it just started flashing through the 3 screens and I couldn't turn it off. It kept logging the run so I kept going. Then it would stop flashing sometimes during the run and I'd press the up or down arrow and it'd start flashing again. Now it's in the cradle and I can't sync it up but the battery is charging. Any ideas how to fix this?
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
In
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/
If it won't start, try connecting it to your computer and see if you can get a firmware update to turn it on. Otherwise I would send it into garmin since there aren't replaceable parts for consumers.
I have read in some other posts about the unit only working while being plugged into a USB port. My guess is that the battery is in fact shot and the unit will only run off the USB port while plugged in.
Submersing in water is not a good idea. On the back of the unit there are some small holes for the speaker. These speakers corrode from sweat and eventually quit.
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