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Just purchased a used 3D printer, monoprice mini v2. as my first unit.

Upon setting up, I noticed the temperature reading were both at 0 and it can’t read the microSD at all (tried a couple I know are working).

I did have to repair the cable to the heat bed, but and confirmed the connection is now good, however it still is not operational.

No movement of any parts, no heat, not reading microSD. Any thoughts as to the cause? I’d hate to start buying random parts until I replace the defective unit…currently thinking it is a motherboard issue.