Another 09 Aveo5 no-start issue - this one's odd

So, first off this thing has been a colossal pain in the ass, but my brother needed a cheap delivery car for JJ's.

He pulled it into the garage 2 weeks ago Friday to replace the lower control arms, and after they'd been replaced, the damn thing wont start.

The issue: Wont start(obviously).

Symptoms: When you turn the key forward to start it, you get no starter click, no fuel pump whine, no dash lights, no chime with the door open, nothing. While the key is on, there is no HVAC, no radio either. Accessory position doesn't yield anything different either. HOWEVER, you can lock/unlock, with the door and key, exterior lights turn on and off, dome and courtesy lights work, and when the door is open, it shows the door ajar light in the dash.

What I've checked:
-Starter is good, jumped the connection under the starter relay and the engine cranked.
-Battery is less than 3 months old. Tried jumping it anyway, just for giggles.
-Pulled the ignition cylinder, and tried to crank it over with a screwdriver, no luck
-Tried a new battery in the key, tried both keys
-All fuses in the fuse boxes are good, as well as the main one.
-New terminal connector on the positive, that one was rotted away. Cleaned up negative post as well.
-Tried swapping starter relay

What's been replaced in the last 6 months:
-Waterpump/thrermostat
-Battery
-Engine harness
-Ignition coils
-Struts/springs
-Tires
-Control arms
-too much other crap to list

Once again, pulled the car in to the garage, replaced control arms, 2 days later, it's like it doesn't recognize that the key is turned on.

Thanks in advance!
Zak

Hookup a volt meter to the battery and see how much voltage it has. Its possible that the battery has enough juice to lock and unlock doors, but not enough to turn on anything else. I would also double check all electrical and ground connections, especially has the at the ECM and BCM

Wouldn't jumping the car make it have enough juice to start? I tried that and still got nothing...

Sounds like the immobilizer is tripped. Scan the computer and see if code P1626 is set. That code light isn't supposed to light up the "check engine" light

The OBD port is dead, tried that as well. I wish I had just a code or something to start troubleshooting with...

When you say "dead", does the scanner even turn on or nothing at all?

Correct. It does not power on.

I realize you didn't get a magic bullet solution here, but did you figure it out??

Have you checked the alternator? My alternator was on it's way out, caused all kinds of weird electrical stuff.