
That is frustrating, but there are a few easy things to try before assuming it is dead. Hold the power button down for a full 30 to 60 seconds since many readers need a long press to force a restart. Plug it into a different wall outlet using a different cable and charger that you know work, leave it for at least 30 minutes & then try the long press again. Inspect the charging port for lint and gently clear it with a wooden toothpick or soft brush, then reinsert the cable firmly. Remove any case and make sure the power button or slider is not jammed, give it a few firm clicks. If it was very cold or very hot, let it sit at room temperature for a while before charging. If it has a tiny reset hole, press it once with a paperclip, then charge and try the long press again. Connect it to a computer to see if it appears as a drive even if the screen looks stuck, e‑ink can look on even when the device is off. If it recently got wet, stop charging and let it dry completely before trying again. If nothing changes after a couple of hours on a reliable charger, leave it plugged in longer and try another long press, since a deeply drained battery sometimes needs extra time to wake. If it still refuses to power up after all that, it likely needs a battery or charging port check from a repair shop or the manufacturer.
One more thing: if it’s an older reader try charging with a simple USB‑A wall charger and a USB‑A cable and not USB‑C to USB‑C, since some don’t negotiate with newer PD chargers; a computer USB port can also gently wake a deeply drained battery. If your model uses a microSD card, remove it and try powering on, as a bad card can stall the boot. Also try the long press while it’s plugged in, which can knock it out of battery protection mode.