Thanks Alex. However, I don't believe that either my power surge protectors or the R610 power supply are the problem here. Please reread my question where I've provided important information and also see the additional information I've provided below:
I have two high quality surge protectors. I have tried connecting the power surge protector to both. It does not work on either one. There are several other devices connected to each of these, including my Luxul router, TV, HDMI switch, DVR and sound amplifier. All these work fine. Until two days ago, the 12V power adapter that supplies power to my R610 Unleashed access point was also connected to one of my power surge protectors and was also working fine. Now the only way I can get it to work is to connect it directly to a wall outlet. My surge protectors are also connected to wall outlets.