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No.......the C340 STREET PILOT has a hidden reset button. Put your fingernail in the slot just under the GARMIN name on the front face plate. Gently pull the face plate outward. Don't take it all the way off. The reset button is on the right side of the front screen just under this plate. Use a pointed object and hold the button IN for 3 seconds and unit will turn off. When you power it back up it will REBOOT.
I have a c340 and instructions say: if your unit locks up. press the power button to turn off the unit, then press again to turn unit back on. If this does not help, reset by the following: place your thumb nail in the groove located under the Garmin logo on the face plate, gently pull off the face plate, press the reset button, turn the unit back on and it should operate normally
Question: Why won't my StreetPilot c3xx poweron?
Found on the Garmin web site -->
If your StreetPilot does not poweron, or if it turns on then turns off, you can troubleshoot the problem by resetting or charging the unit. The reset is a "soft" reset that you can perform in the car; it restores power to the unit, but it does not remove data.
To reset the unit:
Place the unit in the cradle and roll it backwards slightly to lock it in place.
With the key in the car ignition, turn on the unit or put it in accessory mode.
On the face plate of the unit, put your thumb nail in the groove under the Garmin logo and gently pull off the face plate.
With the face plate removed, press the reset button on the right side.
Turn the unit back on. If the unit still doesn'tpoweron, you may need to charge it.
To charge the unit:
Using the provided USB cable, connect the device to the computer.
Reset the unit (following instructions above).
Keep the device connected to the computer and allow it to charge overnight (7-8 hours).
After charging, unplug the unit and power it on.
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The unit does not need an earpiece. Make sure that you do not have anything plugged into the audio out port on the back of the unit. Also make sure that the volume is turned up. If you hear the normal navigation instructions from the 550 then the volume is OK.
If all else fails, then reset both the 550 and your phone. To reset the 550, use your thumbnail to pry the face plate off. There is a small indentation on the upper side of the face plate where it meets the screen. Once the face plate is removed, depress the reset switch on the front right side of the unit.
Check the fuse at the tip of the power cord. Unscrew the round black plastic and this will release the fuse. Otherwise there could be a problem with the power cord. If the cord is defective, replace only a Garmin replacement.
Resetting Your c330 If your unit locks up, press the Power button to turn off the unit, then press again to turn the unit back on. If this does not help, reset your C330. 1. Place your thumb nail in the groove located under the Garmin logo on the face plate. 2. Gently pull off the face plate. 3. Press the Reset button. 4. Turn the unit back on; it will operate normally
The first is the reset under the front face plate. The second is where you hold the power button for a long time (30 seconds).
The last and potentially warranty voiding solution is to pull off the front face plate. Remove the four tiny philips head screws. The front face plate can now be lifted off. There you will see a battery and a little connector with 2 or 3 wires attached to it. Disconnect it. Wait a while... 30 seconds.... 30 minutes... overnight.... and plug it back in.
I've read some reports about the web updater software flaking out, so I recommend flashing through the SD card slot if possible.
take off the front face plate. hit the reset button on the right. charge it.
I've got a 320. Same thing happened. On the 320 if you look closely there is a fingernail shaped indent on the inside of the square colored face plate. just pull the face plate towards you and it will come off with very little effort.