Maybe another of the rare cases of kamikaze 37x0. I've seen a couple that cannot be coaxed back to life by any known method. But there are some other things to try:
First, do as Dasil suggested and leave it on charge for an extended time, up to 24 hrs, using a genuine Garmin charger if possible. If that's not available connect it to a rear USB of your PC for 24hrs and ensure the PC doesn't idle to sleep mode.
Then press and hold the power key for over 30 seconds before releasing.
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