My lint screen has no lint on it after drying a

generically: Danger Will Rogers Danger...Better try to get inside the cabinet and check the venting....
..possibilities:
Vent pathway plugged (hence no lint) and lint backing up inside cutting flow and thermal sensor shutting down heating element.
..Vent hose in hole of cabinet but not connected to duct inside cabinet and lint is just filling cabinet. (common reason for premature heating element failure--3 times for my aunt fixed by tech--before I saw the vent hose connected only to the cabinet)
...both of the above is a hazard and can burn out the heating element.
..might possiblly be able to back blow through the vent hole and/or lint trap with a shopvac/vacuum cleaner (try **** and blow); but if works still need to verify that air pathways are clear and vent hose connected properly inside--should be fairly obvious inside.
...hope helps
....