i have a dmr-e95h. i happened to put a bad disc in it and ran into this self-check loop. in every iteration, it first displays an error message "An error had occurred, please press enter". After the enter key is pressed (hold down for a few seconds), it would reboot, self check, then display another error message "please check the disc". The message would go away in a couple seconds and then it would reboot and repeat the loop.
I found out that during the second path of the loop, i.e. right before, during, and after it displays the error message "please check disc", keep pressing and releasing the open-door key. The door may open. You may want to try it.