Control lock light flashes

I would start by unplugging the unit, use a screwdriver to go across terminals on power plug or scratch on back on the unit (to ground out unit and reset board). With this dryer, it sounds to me you are having a lid lock issue. This should help unlock the unit, try to power up and hit cancel after this and do not pull on door until you hear a click. After this there should be 3 screws on the back to help take the top panel off and access this component, you can test for ohms by unplugging the lid-lock, putting your meter on the terminals, activate the lid-lock mechanism manually with you hand and you should have continuity. Beware though, a lid-lock could be bad and still test good if mechanism is sticking.