Sorry to hear about the trouble with your ereader. I was doing some looking around online, and I came across this:
Have you tried that?
Oops, just tried that link, and it just takes you to the beginning support page. To get to the link I wanted you to see, click on Troubleshooter, then highlight Support-Model-Reader, click on 'continue to step 2', and then you'll see a page with a list of problems and the last one says, "What should I do if my Cruz Reader will not turn on?". Click on "see complete answer", and you'll see a page with instructions on how to open up the reader and unplug the cable to the battery and then plug it back in.
My apologies if you've already tried this.
I hope you get your reader working. I also have an e-reader (a Sony) and I'm really enjoying it.