Screen not detected

Dear all,

I recently used the live usb to check out of elementary and decided to use it as my daily driver. Whilst using the live usb I had no problems with the screen settings. Everything was fine. I did check the screen settings and it said it did not identify the screen but the dimensions were fine. Once I installed to my hard drive and rebooted I had screen issues. It's currently set to 600X800 with not option to change the settings. I'm using a asus vivobook which uses the intel iris XE graphics. Any ideas?