Quoted: What is the best way to cook a Prime Rib steak on a Weber charcoal grill?  Times, marinade, number of briskets, so on.  All of the steaks I seem to buy just dont turn out as good as a Prime Rib from Outback.  Burgers, dogs, kelbosa and anything else turns out great.

Prime rib isn't grilled.  It's roasted.

Now a Ribeye steak (cut from the same rib roast) is grilled like a steak.

Now as an aside, I don't know if you're talking about a "Prime" grade ribeye steak.  If you're talking about "Prime Rib", that's a slow-roasted (normally oven roasted) recipe.

The dish you're trying to replicate.  Does it look like a grilled steak (grill marks on the top and bottom of the steak) or does it look like it was sliced from a larger piece of meat (meaning that the top and bottom have no grill marks)?

Grill marks = Grilled steak.  Your steak was sliced from (basically) a raw prime rib roast.  Then it was seasoned, and cooked over a hot fire.  There are grades of meat.  Usually Choice and Prime.  The difference in these grades is basically the marbling (intramuscular fat) present in them.  Prime being more marbling, higher grade, and generally tastier.  

No grill marks = prime rib.  Your prime rib was part of a raw prime rib roast, that was seasoned and slow roasted.  Once the whole roast was done, it was sliced off of the COOKED roast, and placed on the plate.