Well a "Hard Reset" won't damage a device, nor make it not start. Unless you had say rooted the tablet prior to that, which means you could have bricked it when trying the reset. Or, if it was done incorrectly, that can also lead to problems. Also, the battery could have died during the process, which while not caused by a reset, could have happened at the same time.
First, make sure it is charged.
Second, once charged, try turning it on. Do you get any screens? or no response at all?
If you get no response at all then you will have to look into if the battery or the charger cord need replacing. Should that not be it, the tablet may be damaged and need repair.
If you get it to start, but never completely loads, then the "Hard...