This is what I see on my E7240. In the order of the pictures/timing: The photos you show from your 7280 look very similar to the first one I get on my E7240, but seemingly you don't get any further than that. I would suggest: [IMAGE][IMAGE][IMAGE][IMAGE]
Been having garbled screen issue when installing Windows 10 on this device.   [IMAGE] It's been like this again and again and again, tried new flash drive, iso and other usb slot but to no avail. Help please.
Dell Latitude 7280 - Installing Windows 10 issue