All My Friends Have Off Switches

 is a main story quest in the Fallout: New Vegas add-on, Old World Blues.

Quick walkthrough

 * Go to the Sink and install the Sink Central Intelligence Unit.
 * Find the missing module for the Sink in the Magnetohydraulics Complex.
 * Find the missing module for the Sink Project: Auto-Doc in the Y-17 Medical Facility.
 * Find the missing module for the Sink Project: Biological Research Station in the X-22 Botanical Garden.
 * Find the missing module for the Sink Project: Jukebox in House #108 of Higg's Village
 * Find the missing module for the Sink Project: Book Chute in House #101 of Higg's Village
 * Find the missing module for the Sink Project: Light Switch 01 in the X-2 Transmitter Antenna Array
 * Find the missing module for the Sink Project: Light Switch 02 in Big MT North Tunnel
 * Find the missing module for the Sink Project: Muggy on a truck ouside the Securitron De-Construction Plant
 * Find the missing module for the Sink Project: Toaster in The Cuckoo's Nest
 * Return to the sink to install the modules after finding all of them.

Detailed walkthrough
After receiving the Central Intelligence Unit from the doctors in the Think Tank, proceed to The Sink, activate the Central Circular Structure in the Sink and you will then install the Central Intelligence Unit.