Question about Garmin Forerunner 305 GPS Receiver

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New Garmin forerunner 305 won't turn on, tried all resets

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  • macpl Feb 15, 2009

    Same problem as mine. I`m really pissed off, it happened 2 months after guarantee has expired.

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  • 84 Answers

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.

Posted on Nov 13, 2009

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It does not turn or or charge. Connected to laptop but got same results. Tried to install latest software but it would not the unit (forerunner 305). Message was that there was no unit connected...


Here's a few options: Soft Rest

- Hold down MODE + RESET for few seconds
- Press the Power button to turn on the device

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Hard Reset
(This will erase all of your data inside the device)

- Hold down MODE + RESET + POWER for few seconds
- Press the Power button to turn on the device

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Firmware Downgrade/Upgrade (2.9 > 2.8 > 2.9)
(This will erase all your data inside the device)

Software Downgrade/Upgrade

- Connect your Garmin Forerunner 305 to the computer
- Press the UP arrow button and hold while doing all the other steps below
- Press MODE + RESET for a moment (the computer will recognize the device)
- Dowload the Firmware from Garmin's website.
- Downgrade Firmware from 2.90 to 2.80. (You are still holding on that UP arrow button!)
- When the update is finished the Forerunner 305 should power on running the Firmware 2.80.
- Let go of the UP arrow button, disconnect the device from USB, connect it again and the computer should recognize it normally
- Update the Firmware to the current version.

Nov 04, 2012 | Garmin Forerunner 305 GPS Receiver

1 Answer

My garmin forerunner 305 turns off automaticly after a couple of minutes, and the battery is fully charge.


Try SW reset. Hold Mode and lap/reset for 10 seconds, then release and long press start until device restarts.
Should clean up default.

If not try hard reset, but you'll loose all data in device.
hold mode and start for ten second, device needs to off before.
Then keeping these, pulse press lap/reset.
You'll get a confirmation screen

Oct 04, 2010 | Garmin Forerunner 305 GPS Receiver

3 Answers

Garmin Forerunner 305 won't turn on and won't charge. Is there a fix or is this it for the device?


Look at
"http://www.activesplit.com/my-garmin-forerunner-305-doesnt-power-on-its-just-dead-solutions/"

You can soft reset or hard reset the device. Hard reset deletes all data.

Apr 01, 2010 | Garmin Forerunner 305 GPS Receiver

1 Answer

Garmin forerunner 305 won't turn off and keeps ringing .


You can reset the unit by pressing the and holding the mode and lap buttons simultaneously. This will power it off.

Jul 24, 2009 | Garmin Forerunner 305 GPS Receiver

2 Answers

I have the forerunner 305 - it is not taking a charge and won't turn on??? I have only used it 4 or 5 times


Plug in the garmin to the wall.
Hold down the reset and mode buttons for 3 seconds.
Try to turn it on or look for the "charing in process" words.

Jan 17, 2009 | Garmin Forerunner 305 GPS Receiver

1 Answer

Garmin Foreruner 305 will not turn on or charge


I had the exact same problem and thought my beloved forerunner 305 had finally died. Try pressing the lap and mode keys simultaneously, and then power on. That may do a "soft reset." Worked for me.

Jan 05, 2009 | Garmin Forerunner 301

2 Answers

My Garmin forerunner 305 will not turn on.


I have had the same problem. To fix it, I simultaneously hold down the "mode" and "reset" buttons for about 10 seconds. After releasing the buttons I power it up as normal. This has worked both times it has happened, and I got this fix from the Garmin website. My mileage totals are still in the history.

Dec 14, 2008 | Garmin Forerunner 305 GPS Receiver

2 Answers

NO life in my Forerunner 305


There is a hidden recessed button on the right side of the Garmin. Press this button and it should reset the unit and it should turn on immediately.

Jan 13, 2008 | Garmin Forerunner 305 GPS Receiver

1 Answer

Garmin Forerunner 305 usb cable won't be read


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.

Dec 16, 2007 | Garmin Forerunner 305 GPS Receiver

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