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I would advise you to leave it on the charger for at least 4 hours, continuously and without interruption.
Then try turning it On normally, once more.
- If it fails to turn On, it probably needs a new battery, or else needs to be service-repaired, depending upon its age measured from its date of original purchase.
- If it turns On fine, see whether it stays On for a reasonable interval (a half hour at least.) If it does stay On that long, the battery's fine and it just had a temporary problem.
Let me know, what happens, and how old the Kobo is, please, and I will advise you further as appropriate.
That's OK - no need to call me.
So - does it still not power On ?
And it is 2 2/3 years old, with limited usage. That means, it is most likely that the battery is defective - that happens when a device with a rechargeable battery in it is left about for months at a time unused... unless the battery is of one particular type that does not mind such disuse. But in many rechargeables, disuse is even a bit more stressful than abundant and regular charging up and discharging.
So I think the battery in the Kobo has failed. Would you be interested in having it repair-serviced, or even perhaps in replacing the battery yourself?
Holding down the power button for 10 seconds may actually have caused it to shut Off, or shut down.
But if it won't turn On again, that might not be the battery at all, if you have charged it for at least 2 hours continuously since then. ?
Yes. Try that, get back to me about it 2 + hours from now, and I will instruct you further and as appropriate.