I've got a HR23-700 that's plugged into a APC. Probably should have replaced the battey a long time ago. It's about 3 1/2 years old. We experienced a power failure that lasted a day and a half. Now that we've got power back, the HR-23 seems to be dead with the exception of the power light on the left hand side. The blue light in the middle is not on. The TV says 'No signal'. Reseating the access card and pushing the red button to set it does nothing. Plugging it into a outlet that's good does nothing. Any ideas? Time to replace both?