I do see two ribbon cables (similar to IDE controller cables with pin 1 painted red).  They run from along the sidewalls of the case.  It's hard to see how well they are connected, though.  There is a green LED light next to them (both sides).  I'm not sure what that is indicating.  Should I pop the case off and make sure they have a good connection?

The PSU I am pretty sure on.  I jumpered the main plug from green to black and it turned on.  When I turn power on, it seems like everything is kicking on for a second and then it just goes to idle.  I can check voltages, etc. with a multimeter.  But I'm not sure what everything should be.