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Your particular unit runs it's software from SD-Card.
you need to check if the card is not damaged: while unpowered push the SD card to come out insert it in a card reader on your computer and see if it reads it ok, if it ask's you to format it it means it's damaged and should be replaced ( the sd card of your tomtom should be replaced with another SD card which you should buy from tomtom for your particular device not a generic one). if it reads just fine reinsert it and start the device again..And about the reset the correct procedure is: Press and hold the On/Off button until your device restarts. This can take more than fifteen seconds. You should also install Tomtom Home on your computer, connect the device and update it if al the above failed (with a verified and working SD card inserted) - link for Tomtom Home: Windows, Mac
Connect it to your pc then turn it on. It should either connect or ask you to connect to the pc. If tt home opens shut it down. Do a complete backup of your unit onto the desktop. DO NOT USE TOMTOM HOME TO DO THIS!!!! After doing a complete backup format the drive on your tt useing fat 32. Open tt home and let it reload your os. Do this a couple of times to get the newest os. Disconnect your tt from the computer the way you normally do and restart your tt. Reconnect your tt and do not let home start. Go to your backup and copy and paste your maps back onto the root of your tt. If you have any question email me.
Hope this helps
Connect your TomTom to the USB cable then turn on your TomTom in that order. Go to "My Computer" and open the drive that is your TomTom. Copy and paste your map folder to the desktop. Delete everything on your TomTom (don't format). After deleting everything on your TomTom. Open TomTom Home. TomTom Home will tell you, you need an application for your TomTom. Let TomTom Home load the application. You will probably have to do this at least 2 times to get the latest application for your device. After TomTom Home has loaded the latest application for your device closer TomTom Home and copy and paste your map back onto your TomTom. You should be ready to go after doing this. Make sure you do not skip a step when doing this.
On the bottom of the TomTom there is a tiny hole that you stick a small paper clip into. This is a reset button. Its almost not visable you really have to look for it. I have the same problem but I hit the reset and it fixed the problem. This reset won't change or hurt any of your settings it just resets the hard drive.