ok... so... i checked the thermal fuse.. which is still good.
and i just checked this one (in photo) and it also is GOOD.
the scenario again : the dryer was on all night. in the morning, the dryer was still running. i stopped it.. and now will not start again.
could it really be the door switch ? i am willing to check every possibility... but just wanted to restate the situation for clarity.
thanks as always for your expertise and help.