In case others are searching for a solution - I found that the "d" on my keyboard was stuck. This caused the computer to go into a display troubleshooting mode.
You can check this in your case by unplugging the keyboard ribbon and then starting the computer with either no keyboard or with a usb keyboard.
the pressing D has helped us as it helped us work out an issue on a E5470 and tested it on another machine and User got it at startup.
Maybe replace the keyboard once cleaned to see if the issue goes away