“made for Japan. Does that mean it is specific to that country only? Software, language etc?”
If PC is bought in Japan one can get Japanese tech/telephone support only . When I had problems with my Dell - whose telephone support is in China - they wouldn’t hand me over to an English speaker so my wife had to deal with them . Lousy support which is why I didn’t buy another Dell .
I bought a dell some years ago. In the first couple of weeks, for whatever reason, the hard-drive went south. They sent a tech to my home and changed out the drive and it turned into one of the best pcs I've owned. It was a true workhorse. Of course that's just my personal experience.
Those companies are not doing right by you. You should be able to call any of their affiliates to get support. Good luck. I hope you get it resolved.