Thank you to all.
And as you probably surmised; I am new to the game mechanics. I'm also balancing: 2 first time players (gun bunnies); 1 player who wants to be a character from a novel and not a working system of skills, attributes, and gear (a mage not geared for healing or destruction), and SIR MinMaximus the Melee combat Cyber Adept with .6 remaining Essence; Unstoppable and Indestructible.
The two newbies aren't a problem. The mage is also not bad. In fact, a mage focused as an investigator, or some other non-combat role can be a huge asset to the party. They need to have at least SOME combat ability, of course, but a mystic private eye type character leads to a LOT of interesting plots.
No, your problem is with the one you name SIR MinMaximus, and from what I'm hearing, he's well deserving of something I call the 'Phonebook Method for Keeping Games Fun'. It is really simple:
Step 1: Get a phonebook (I prefer the Metro Atlanta phonebook, for thickness). If you can't find a phonebook, use any suitably large book, though make sure it is paperback.
Step 2: Beat offending player about the head and shoulders with phonebook.
Step 3: Repeat as necessary, until the stupid stops, or the player loses consciousness.
Step 4: Run a game without idiots trying to break things.
Seriously, though, you need to take that player to the side, explain to him that his level of cheese is breaking things, and tell him to tone it down or find another table.