Joseph, if your car is like mine, the hinge on each side has a detent that must be pressed in to allow the hood to stand vertical. Kind of tough to press each side at the same time AND push the hood up (requires three hands!). I think the detents are offset a bit so you press the driver's side detent first, push the hood up a bit, then press the passenger's side detent and push the hood up to locking position.
I can't begin to count the number of times I (and others) have bumped my head on the grille part of the hood in the first position!
95 E320 Cabriolet, 131K