how can i fix my Philips dvd R610 ???

my recorder has suddenly started playing up ? when you put a dvd-r disc in it wont bring up the contents of disc,if you click browser it locks on busy & freezes all controls.You have to power it down to regain access.It will no longer record & indicates wrong disc etc.when you try any other functions the error message displays ? I have tried everything in the troubleshooting section of my manual to no avail.Please can you help ???? Ezz