Newly bought kocaso tablet started to show a vertical line coming straight from top to bottom at both left and right side of the screen and its annoying how to fix this problem.

Here is straight link for you. All you need is pdf reader.
http://www.kocaso.com/manuals/MX9200/MX9200_User_Manual.pdf

Return it to where you bought it, someone has customised the start up screen.

I found the factory reset button on the back under a small sticker. Plug it into the charger and gently push a sharp toothpick or other sharp non metallic object inthe the small hole until you get resistance. Then gently push 'till you feel a tiny click...this should reset the tablet. Mine crapped out because it is a junk company. There are more complaints on this company than any other I have ever seen. I wised up and bought Google Nexus 7...best 7" tablet made.

screen cable dislodged or new screen needed

Touch screen have an X/Y axis running from top to bottom and side to side. If the crack appears, one or more conncetions will be shorted out and the screen fails. Looks like you need a new unit.

Have you tried re-loading the firmware?

Here is the page with instructions, and the firmware for your tablet.

Support Firmware

I spoke with Kocaso...no fix yet, so I returned mine...I had the M9100...junk!

Just click this link and then the M1050 pdf on the left side.

You should be able to find what you are looking for herd.

Use the firmware for SX9701 at the bottom of the page http://www.kocaso.com/support.html.

There are instructions to follow and you may need to use the Phoenix Card self extractor. Links are all on the same page.