Fan not Running! Ventilation insufficiant

Hey everyone! Ive got a great big ol problem.

I get the "Ventilation is insufficiant" error coming up on an XBOX 360 E.

I have opened the device up, and ran it without the case, where i get the same issue. at this time, the fan is never running. i have tried many things to get the fan to run, which are listed below.

1) I Applied 5.5V directly across the fans /+ aGND/ pins. The fan ran, which told me, that the pins on the board are not supplying sufficiant Voltage to the device.

2) With the knoledge gained from above, I Decided to try a 12V Mod, and i spliced the /+ to GND/ of the fan to the /12V to GND/ of the Disc Tray, which still provided no power to the fan.

I am unable to figure out why the device will not Fan On. does anyone else have some information i can use to fix this issue? the device knows it is overheating, but wont power the fan.