Firmware updated locked up C150

I ran the Sansa firmware updated which detected and downloaded an update for my c150.  Upon reboot, its little screen said to press play to install the update, which I did.  It then said update was successful and it restarted itself to the Sandisk logo.  But that is all.  Now all it does is display the logo screen.  What can I do to get it to behave normally again??  I followed the instructions exactly with the updater so I’m more than a little annoyed that it has locked up my unit.

Thanks for any help