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I have a sony Xperia 1 J8110 that has gone off since Monday and can not turn back on. I tried doing the hard reset but it doesn't seem to work as well? any help would be great
First see that it is charged.
Then start and push vol-down and power together.
When that does not help use Xperia Companion and do a software repair.
The manuals can be founde here.
If you need further assistance, come back here and ask.
You can also check the steps in this link: https://www.sony.co.uk/electronics/support/mobile-phones-tablets/articles/00235685
If the steps didn't work, you will need to contact Sony to arrange a repair service for your phone.