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Did these units work and then failed or they never worked?
If your unit worked before, under what circumstances the unit stopped working, new hardware/software was added, any update etc?
If you don’t get any light or power at all, you could try with different power adapter?
Do you get any fan activity?
If there is no fan activity and if the computer is not beeping and the Diagnostic LEDs and caps/num/scroll lock LEDs are not flashing or lit, unplug all connections and remove all media communication devices (external monitors); reconnect one at a time and check if the unit functions.