hello i have a problem with this laptop. Flat cables that connect sub and mainboard or something is damaged. The problem occurs that laptop lost wifi and sound and also half led light on keyboard. I think the problem is in flat cable. Since this laptop has 2 boards i assume that flat cable connecting them is somehow damaged. But the thing is power button is on sub board and it is working as inteded. How can i diagnose that this problem is not flat cable or something else without buying parts? Please contact me @: lazar.dencic@icloud.com