I started to go into the securitron vault when House was still in control, but didn't enter beyond where House's computer was. I later came back to the vault after i killed house and the door beyond the computer was locked, and stole the chip by killing the front gate guards at the fort. I put yes man in control of strip and killed all of the legion members at the fort including Caesar. i went down into the securitron vault and could not enter the door, or communicate with Yes Man.

is there anyway i can get into the securitron vault without having to start over?? (also im on the PS3 if that helps any)

What happens when you click on the machine/computer that opens the vault?