1. Turn on Power
Walk through the Cal-de-sac and head to the Power House. Once in the Power House Locate and turn on the Power Switch.
2. Complete Lockdown
Head down to the bunker and interact with the computer. You will need to complete a Lock-Down sequence to begin clearing the Nova Gas. This will spawn in infinite Nova Crawlers and zombies for about 1 Min. Once this step completed head to step 3 below.
3. Repair Ventilation
Now you will need to locate the 4 Ventalation fans around the map. Interact with them to repair. Look at the maps around map to know the locations of vent fans. Then Looks for green smoke coming out of the houses to know which ones need Repaired.
Pack a Punch will now to powered on to Pack Weapons.