How to troubleshooting my project

I wanted to make this led display project ( Digital clock Max 7219 dot matrix Random animation & how to set the time in the RTC module with code - YouTube ) so i bought all the materials needed but it didnt work the led display is flashing in a random fashion and even turn on when the vcc and gnd aren't connected to the display.

To check the other part and the board i tried to connect the arduino and display directly using this video (Arduino Text Scrolling Display | MAX7219 Dot Matrix 4-in-1 - YouTube) but still not working and still turn on even while gnd and vcc isn't connected to the led

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Show us a good schematic of your proposed circuit.
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How to troubleshooting my project

Hello mimom
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Have a nice day and enjoy coding in C++.
Дайте миру шанс!

@mimom

Your topic was moved to its current location as it is more suitable.

Thank you

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