Yes, you could have contributed to the problem by using the wrong charger. But I doubt that all is lost. Assuming that you don't have the infamous "loose" port or "bad connector" hardware problem, and you cannot get the KF to boot either by going through the entire "reboot/hard reset"procedure or simply by pushing the power button briefly but firmly with the unit UNCONNECTED to the charge cable, I'd suggest that simply plug in the KF and LEAVE IT ALONE for four hours or so. (Don't check to see if it's responsive. Leave it alone.)
At the end of that time, unplug it and try to turn it one by briefly and firmly pressing the power button. Don't push it repeatedly. Be patient and give it a minute or so to boot. After that try it again once or twice. If it still fails, get in touch with Kindle CS.
Your KF may have become "confused" about its current state. If so, it may be able to "unconfuse" itself if given the chance, but repeated pressing the power button or disconnecting and reconnecting the charge cable may only confuse it further.
Give all that a try and let us know what happens.
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