Power Supply Seems to not work?

Just built my fabulous eggbot, but upon trying to calibrate the pen arm the servo would not move or respond at all. Through some digging on this forum, I saw that one possible problem could be the power supply, and to try unplugging the USB to see if the EBB still lights up. And alas, it does not! Can anyone offer advice? Surely I cannot have confused something as simple as plugging in the power supply.

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