How can i complete a self check?

I have a Panasonic DVD recorder DMR-EZ25EB, when switichng it on the code U61 appears but the starts to complete a self check - this never completes and tells me to switch off via power button and swith on again but nothing has changed. How can I fix this?

There is a picture underneath the error code and volume just can't press any other buttons when this message on, if i press return it also switches the unit off