I wondered if it was a dead hard disk but then I saw this:
https://forums.digitalspy.com/discussion/1697059/sagem-dtr-67250-t-dead
If you can find a power supply with the right connector and the right voltage rating and at least the same current rating as the old one, try that.
Digital spy forums might be a good place to ask further.
Fghhj
August 2023