No power It won't turn on. Even when plugged in.

Pull the SD card from the top and make sure you have the appropriate update from the cruz website on it. Follow flash instructions.
Test the power cord with a voltmeter to see if its giving power. ****** works well too. Not really don't do that, I mean it'll work but get a tool to check it. Someone who works on cars or their house will probably have one.
If that doesn't work, open the back, pull the battery plug and then plug it back in. If it still doesn't turn on you're probably beat. You can look further into digging in and removing other internal parts to attempt to reset whatever it is that is wrong but most likely it's an issue along the power line on the way in or the jack itself. If it had a surge it'll be something further that is fried. In most cases you're buying a new one.
Keep an eye out for the t301 its much more capable and prices drop to about $70 during sales. The touch screen is real (capacative) which is a major improvement and you have a lot more space to download stuff.
goodluck