Why did you bash the tablet on the back
You did go out of the way to give it a knock you are either going to have to send it direct back to linx for a repair or put it on eBay and sell as faulty but newish unit. Someone might be able to replace the screen for you but considering you seem to think a hit will fix a power issue I wouldnt suggest doing it yourself.
Try holding down the power on for 3-5 seconds I sometimes find I need to hold it for a period of time for it to come on.
I've got the leather edition and the blue light never changes when fully charged this is a known design fault that seems to be only with the leather edition of the tablet.
I've also noticed something I got a shortish usb cable that connects to the plug I've purchased one thats twice as long to make it easier for me to charge and use/put down and i find it doesnt charge quite as quick need to check if its rated as 2amp 5v might only be 1amp rated.
Power and WIFI and Micro SD are the biggest issues ive seen so far with these. If you suss the power indicator / switch on, the wifi drops and the micro sd speeds these will be an amazing piece of kit right now they are great but needs some work by the user to get these fixed when it should be sorted ready for the end user to just enjoy.
Welcome to the forum, but please refrain from bashing
PS. Only use the plug they supply thats mentioned in the manual they don't say anything about using a different cable though.