Flashing greens-fixed
I have an old Roamio box. Replaced the hard drive a few years ago. We had a power blip and the TiVo would only flash the green lights and display power on device. I was about to send it off or buy a new one. I left it plugged in overnight and it fixed itself. We had another power blip yesterday and same thing. I changed the power supply with a higher output one. That didn’t help. Another overnight sit( plugged in) and it fixed itself. I have now plugged it into a UPS.
Sharing in case anyone in the same blinking light situation.