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Irregular blinking disc activity light is much better indicator that computer or reader is active and not frozen than animated spinning wheel or sequence of boxes appearing over and over. Even then processor could be swamped trying to process more than it can handle, poorly formatted book or corrupted database. My T1 has such a blinking light under micro SD card cover and was sometimes blinking entertainment that could not help processing problems. Kobo has color changing red, green, blue blinking power light that don't blink for long and I don't remember what colors indicate.
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