Just say I need a plain ol' power supply for a Dell Dimension and I have 
the bad one in hand.
Then say I need to get a replacement today. 
Then I tell ya that I typically go to general nano or [mu]Center, but 
I'm time constrained near Portland Ave and Lake St.  (pretend I have to 
ride my bike!) 
If anyone has a recommendation, I'm all eyes.  TIA!