Wild Card: Change in Management

 is a quest in Fallout: New Vegas.

Quick walkthrough
This series of quests leads to one of many Fallout: New Vegas endings. Once you discover Yes Man, he will explain Benny's plan for killing Mr. House and taking over Vegas. The player will then be able to choose to continue Benny's plans and taking on this quest. You will have to head towards the Lucky 38 penthouse, locate the chamber in which Mr. House actually resides, and choose to either disable or kill him. After killing Mr. House, meet Yes Man outside The Tops casino and accompany him to Lucky 38.

Detailed walkthrough
After entering the Lucky 38 penthouse, find a terminal on the wall near Mr. House. This terminal will allow you to unlock a hidden door leading to Mr. House's chamber. Unlocking the terminal requires either: After activating the door, an alarm will sound, and the securitrons will become hostile (easily defeated with the Pulse Gun). Behind the hidden door lies another terminal, as well as several securitrons which will attack on sight. Activate this to head on to the control room.
 * 50 science
 * A Lucky 38 VIP keycard from the H&H Tools Factory (top floor)
 * A Lucky 38 VIP keycard from Chief Hanlon's desk in his office (inside the main building at Camp Golf).

Once in the control room, there is one final terminal. Activate this terminal to release Mr. House's isolation chamber and expose him to the outside world. You can then talk to him, and he will tell you how your "Vanity Project is doomed to fail". You then can decide his fate by going back to the terminal and choosing to either kill him (also possible via the "Sterilize chamber" option) or leave him helpless, both of which resulting in loss of karma. Note that once the isolation chamber has been opened, regardless of the fate you decide for Mr. House, he will die within a year from exposure to outside contaminants.

To pass the initial terminal you can choose to either pass a Hard difficulty hack or execute an Executive Override and obtain the password to the terminal from either H&H Tools Factory or the hotel in Camp Golf.

If you decide to kill Mr. House, you will receive the note A Tragedy Has Befallen All Mankind, and the quest The House Has Gone Bust! will instantly be started and failed.

The Kill or Disable Mr. House stage is complete once you either kill or disable Mr. House. This can be done before or after you speak to Yes Man the first time.

Sometimes Yes Man disappears after you kill Benny, if you leave Benny's apartment and return later. He can be found standing outside of The Tops Casino. You can tell him to meet you at the Lucky 38 without incurring any faction penalties. Once you meet him in the Penthouse of the Lucky 38, where House's avatar formerly spoke to you the first time, the installation of Yes Man event is triggered. This triggers two quests, Beware the Wrath of Caesar! and Don't Tread on the Bear. This puts you on notice that working with Yes Man further will cause you to be unable to work with those factions.

You can let Yes Man wait for you at the Lucky 38 until you finish most of your other quests with the NCR and Caesar's Legion and are ready to proceed.

Bugs

 * After having Yes Man installed onto the big screen, you may be unable to quit first person sight. (Note: this glitch doesn't ever go away, resulting in that you WILL have to reload!)

Sometimes the Securitrons will not attack when you open the terminals. This can be very helpful. It is not yet determined why this happens. Complete the all other wildcard quests to prevent these two bugs from happening;
 * XBox 360 and PS3: After disabling House the objective does not check off which prevents Yes Man from meeting you outside Lucky 38. (Double check that you have selected the option to permanently disable House from all systems on the same console used to wake him from the chamber)
 * XBox 360 and PS3: If Benny escapes to the Fort, the journal entry will be 'Retrieve the Platinum Chip from Benny at the Fort'. The quest marker will point to the raft at Cottonwood Cove. After travelling to the Fort, the marker will disappear and Benny is nowhere to be found.
 * PC: Benny is found in Ceasars tent. You have to kill Caesar and his guards.  Get the chip off of Caeser and then talk to Benny.


 * When Yes Man is going through the upgrading of the securitons he will stop after every sentence he speaks and will not continue.you can however open and close your pipboy 3000 twice after he finish's speaking a sentence, however you will;
 * After the walkthrough of the upgrading of the securitons finishes and YesMan tells you to meet him back up top or to feel free to leave you will not be ported back up to him and will not be able to get out of the room.


 * PS3, Xbox 360 and PC: Securitrons may not become hostile

When you need to kill Mr. House you may not be able to see the computer screen and then if you aim down iron sights you will see a computer screen.