Casio WK -3000 faulty not sure what's going on

Just bought a Casio WK- 3000, it was cheap as they said the left speaker didn’t always work.
Unfortunately it seems that there is much more wrong with it.
1 - Nothing ever shows on the display (except the printed on keyboard).
2 - Demo tunes play perfectly.
3 - Left speaker seems to work when I do somethings but not all the time.
4 - It makes a big electronic “bump” when it turns On or Off.
Does anyone have any ideas hoe I can start troubleshooting these issues, when it plays the demos it sounds great so I’d love to get it going properly.
Looking forward to any advice.

Factory reset did the job.

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