My nextbook android tablet is showing only a black screen after the load screens

SOURCE: my android tablet is "frozen". Will turn on but

has anything been deleted from it when it has been plugged into a computer or has anything been deleted from the device itself from its root directory? if not and its gone like that by itself, it could be corrupted software or a missing root file which is usually bad at first, now what i know about some tablets is if it wont work theres a recovery file usually internally but this is in some tablets only that ive read about, i also have one but havent needed to try to restore it and it can be done from an engineering mode, this is possable by pressing the power button and another button like the home button at the same time once the unit is off untill it turns back on with options, but as for some models im not sure of but i will have to look this up at some stage as i am working on tablets at this time so unless you know what you are doing i wouldnt attempt it, once i have gotten through some tablets ill be able to give a better resolution on this subject with others. the advice ive given wont work for all as pressing power and home will start different options up on different tablets and versions.

SOURCE: The tablet turns on but seems frozen and shows the android screen and nothing else. Tried to reset it but it does the same thing

so wat do i do

SOURCE: I can't get my NextBook premium 8 tablet to start OR reset.

I just bought a nextbook8 tablet and the screen looks very blurry with a lot of glare. Is this a common problem with this tablet? Is there anything I can do or buy to correct this problem? My eyes really hurt looking at it.