Initial setting:
Press March&Waltz+PartyTime+ShowTime/TradDance and hold down until Power on the keyboard.

Regarding screen, check the contrast-slider in lower left side of the screen, if that one is totally upwards, you see nothing but blue light screen. Push it downwards to prefered contrast.

Hope it helps
GJ
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)