kamvas 13 problem

so when i was using the tablet, the screen just turnt off, and it kept saying it keeps saying ''power saving'' when i turn it off and back on. s-So I tried to just uninstall and reinstall the driver again and that didnt work. Now, every time it plug in the HDMI, my laptop monitor screen turns off. For some reason I could still go to osd settings, but the ''display'' icon was darker then all of the other setting icons, so I could still use the tablet, but it isnt showing anything. What should I do?