Navman icn510 will not turn on....it has started twice but screen goes blank.

Bad battery Either rechare or replace it

Please rate my help++++Thanks for using FIXYA

and where do you get it from in victoria aust tell dave.

I think the best solution, due that it is a non upgradeable model by the official site, you can unlock and install another software.
I have the IGO and goes terrific

I bought a Garmin Nuvi 660 WT FM UK& EUROPE
Problem solved.
Thank you
Sparkey3

You can buy a new battery in ebay and replace it. It is very easy: unscrew the four screws and open carefully without sd card(look at the phoneplug and sound roll). You will see the battery with its connectors... same as you bought it.

Depend on your location you can get it from
http://www.support.navman-europe.com/support/support/

I have a copy of the manual for the icn510.
It's 4 mb and a pdf file.
email me at dave[email protected]

Is it just possible you left the Navman mounted on the screen in hot weather whilst away from the vehicle? I made a little white jacket for mine with a heat reflecting liner.

Your Navman is in Demonstration mode and is demonstrating a route that you have set up. It should be flashing SIM alternately with the time taken on the route so far. 
If you don't want the 'Demonstrator' to operate, you can turn it off. See your manual. If you have not got one, you can download it from the Navman site. 
I only have the iCN510 and I have to go to the main Menu screen, tap 'Route Information', then Cancel Route to cancel the current demonstration. 
To turn off Route Demonstrator from Main Menu  Settings  Routing  next screen  Untick 'Demonstrate Route. 
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How long are you waiting and are you moving while it is trying to acquire signal? These receivers are using older circuitry that may take up to 20 minutes to first acquire a signal from a cold start. If you are moving it may take longer!!! The good news is that after you have initially acquired a location, if you turn the unit off it will only take a minute or so to reacquire after it has "warmed" up.