Stuck in Doom 3

[bradclark1]

I'm in Delta Labs 2A and my missions are:
1) Retrieve plasma inducer from the ops server room.
2) Go to Sector Security and terminate ops lock down.

I've spent over 3 hours going around levels 1 and 2 and covered every inch of them numerous times. I have found the scientist who needs the inducer,
found the secret compartments in the infirmary, killed everything and now I'm ust going around in circles.

Thanks for any help.