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Not very helpful article, but generally the three things suggested for this(especially if not seeing red light), is to plug your unit into the wall and do a factory restart of your device. If it wasn't previously plugged into the wall, may just do a System Restart before the Factory Reset. The third is to replace the power supply cable and the power supply adapter.
Sometimes, just unplugging for a bit will solve the problem.
Roku Community Streaming Expert Just another Roku user... I am not a Roku employee. Insignia RokuTV, Ultra 4660x, Premiere+ 3921, Express 4k+ 3941