"Why is my Nook HD not turning on?"に関する回答I had similar symptoms with my Nook HD+ : when plugged into charger the indicator light turned green, then orange, but only for a second, then went dark. When left on charger for many hours, the indicator would start blinking red. Nothing worked, until I read technical details in this post: https://forum.xda-developers.com/showthread.php?t=2796915 The bottom line: if the battery voltage drops below 1.8 V, the stupid control chip assumes the battery is "bad" and refuses to pass the charging current; consistent with the observed symptoms. This gave me an idea on how to fix this: Step 1: Open the Nook by prying the front panel to get access to mounting screws, then unscrew the back panel. Step 2: Locate the battery cable composed of three red, three black, one blue, and one yellow wires. Step 3: Locate the gold test points on circuit board _under_ the wires: "VBAT" under the red wires, "BAT-" under the black wires. Step 4: You have to trick the control chip into "thinking" that the battery is still "good"....
"Standby On Button Blinking; Disk Tray Locked; Won't Turn On"に関する回答The answer was posted in another thread by Derel LeBrun: https://www.youtube.com/watch?v=8NeeC4kU... It may be a bad capacitor in the PSU board.