Get old laptop repaired (lenovo ideapad z710)?

Have a relatively good Lenovo laptop with i7. I used to play minecraft in the past, but if I drive it up now, it always takes forever, and then I have a black screen, where personal settings are made, but nothing happens. Is it worth it to repair? How expensive would something like that be?

Presumably, only Windows has gone, sounds like an update has failed. Just create a Windows Boot USB stick and choose the repair options.

Try the recovery partition first.