Your tom tom go 300 may be frozen. If it has a reset button, then try resetting it. If that doesn't work, leave it unplugged and let it die. Then try turning it back on and see if it works then. If it doesn't, then you might have to update the software using this website which has instructions: http://www.bashys-place.com/forums/showthread.php?p=14685
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It is probably your internal battery and needs replacement. There is a menu function to not shutdown when loss of power (under battery preference, after screen save). If you don't use the battery, try this.
I found a toll free number for TomTom, called and actually got a real person. My computer recognized the TomTom (TomTom home was version 7. something); my TomTom unit had software that was too old and it did not recognize the TomTom home. Catherine in tech support sent me a download to update the software and it worked. Thanks for getting back to me. I am attaching the link for anyone that needs to update software in their TomTom GO 300:
I had a similar problem when trying to update my dad’s old
TomTom Go300. I bought a new map and downloaded TomTom Home 2 (as
instructed on the website) but found that the Go300 was recognised by the computer it wasn't recognised by TomTom's own Home 2 software.
To cut a long story short I uninstalled Home 2 and downloaded Home 1 (from http://www.tomtom.com/plus/service.php?ID=17 Home 1 is the one on the right, listed as being the version of Home you use for Navigator 6).
Then when I switched the Go300 on it was recognised by Home1 - although the new map I had bought wasn't listed as being available for download.
However, I updated the Go300 with the available listed free updates, then switched it off.
Downloaded Home 2 again and switched the Go300 on - this time it was recognised by the computer and the new map I had bought was available to download.
So far so good - the only problem was the the postcode search facility was not the same as it had been - I could now only search the first 4 digits of the postcode. There is a fix for this on the tomtom website:
Hope this may be of some use to someone! It took me hours to figure it all out. But it's up and running now.
I read and read and re-read the TomTom website looking for any info
that would help but came up with nothing. A few hours later and the air
thick with torrents of language I didn’t think I was capable of I
discovered that I needed to download Home1 first and let the Go300
connect to the computer via Home1 before it would be recognisable by
On the website, though, Home1 is listed as being the version you use
if you have TomTom Navigator 6. It’s not even called ‘Home 1′.
Confusing eh? Anyway, I downloaded that and from there found that I
could get my new map onto my Go300. Once the map and other updates were
installed and I had switched the thing off I then found that Home2
recognised it at last.
That had to be one of the most ridiculously long-winded things I’ve
had to do on a computer, mainly because TomTom’s confusing advice on
their website made the whole process so damn difficult. Perhaps they
hoped I’d give up and buy a new one? Tsk.
"My tom tom wonts switch on. I have reset it and still it comes on with a boom boom noise and shows the 2 hands on the screen. It also shows the loading bar at the bottom, but then it just freezes and nothing happens. can anyone help please ASAP"
Sound as though your Map data card is corrupt. Remove the SD card and check it with your computer using a card reader. Backup the SD card onto your computer. You can run either chkdsk or go to the drive letter under 'My Computer' right click and select properties, then tools, then check now. You can also try starting the Tomtom with the SD card out of the unit. It should show a picture of the Tomtom with a 'X'. You can also try copying the data on the SD card to another SD card.