My ideatab A2107A-H does not start up after I turn it to dim.

Question

This tab gave to me by my father this christmas. But he already use it by a shorttime. And when I surfing in the internet I dim it because the class was starting on and while our teacher was go out for a while I turn on for a second my tab to check if it is done to buff yahoo mail it doesn`t on. I try many patterns to on it like when you reset or hard reset your tab  but does not effective. Please help me to solve it. It does not also low bat, drop, squeez or turning off. And when I turn it on for a many seconds its like a have a little bit of sounds on the battery when I put nearly my ear to back of my tab. And thanks already to those who help me. 

Answer 1

There are four general causes of this issue:
1. The computer's PRAM no longer contains a valid startup disk setting when there aren't any problems with the disk itself. This can be checked for by pressing the Option key and seeing if the drive appears.
2. The internal drive's directory structure has become damaged. This requires usage of an alternate bootable system to perform the repair.
3. Critical system files have been deleted. This requires usage of an alternate bootable system to reinstall them.
4. The internal drive has died or become unplugged. This is the most likely case if the computer took a sharp impact or there are unusual sounds coming from the hard drive's location.
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