This sounds more and more like a failing HDD, sadly.
My only other suggestion is capcitors most likely on the power pcb.
I suggest you !ook carefully at them all for bulging tops.
Do make doubly sure you unplug unit from the mains.
IF it is the HDD then likely you have lost the recordings. I have posted on this forum how to replace the HDD, also how to salvage recordings ( but this is very very time consuming) and how to spoof a copy of a HDD such that the Panny will not insist on a format (but you only get one shot at this before it will insist on a format and the process does not always work)
My only other suggestion is capcitors most likely on the power pcb.
I suggest you !ook carefully at them all for bulging tops.
Do make doubly sure you unplug unit from the mains.
IF it is the HDD then likely you have lost the recordings. I have posted on this forum how to replace the HDD, also how to salvage recordings ( but this is very very time consuming) and how to spoof a copy of a HDD such that the Panny will not insist on a format (but you only get one shot at this before it will insist on a format and the process does not always work)