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ACEPC Mini PC, Intel Celeron J4125 Processor 8GB DDR4 / 256GB ROM Windows 10 Pro Mini Computer, Triple Screen Support/4K HD/Dual Band WLAN/Gigabit Eth

This has stopped working - when i turn on it says it can't find a boot device???????

I would try reinstalling the system, which you can find in the File Download section. You'll have to know which model you have in order to download the correct system for installation. The installation instruction video is also there.