I bought a new all n one lenovo b540 today and tried to load mate on it. it worked but the screen started dimming after 5 mins then within 10 min, the screen would go dark and i would have to SHUT DOWN, not reboot, the whole system and boot up again. Its nice and bright then the same. So i logged into windows 8 and the same thing happens. Took it back and got another, it didnt do that but when i tried to download 13 again, i got a black screen with a lot of scirpts that look like something in the terminal. so i just stopped the install. any suggestions?