LCD has failed.
This site sells you the LCD panel, and for people with no skills...they offer a repair service too.
It's one-stop shopping for everyone --
So, depending on your model, you can replace the screen or send it in and let them fix it.
And your Tom Tom is no different than my Tom Tom...just different maps on it, that's all. Yours was built in China and so is mine.
The Reality is...it's the same price as the most inexpensive Tom Toms are.
If you have a top of the line model, the repair service will save you $100. If you have an entry level unit, you might as well get a new one with lifetime maps on it.