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Overhead - Autofail "on" and Autopilot unresponsive

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I recently built a new computer for the better performance of FSX, thus I reinstalled PMDG 737NGX 800-900 base package.


Whenever I reached the cruise altitude, somehow, "Autofail" light was illuminated along with Altitude was cancelled with sign "--------."

I searched the support forum, and I found that it could be "pack" switches failed to set as "auto" and I made sure that all pack switches were properly set, but no success. The same problem.


Thus I decided to exactly follow Tutorial #1, which began with "Default" way without changing any overhead setting, but I found the same problem. Before reaching FL250, I had "Autofail" indicator on, then eventually autopilot system became out of control.


I assure you that I did all the best I could, but it seems that it would be something else beside "pack" switches. I would greatly appreciate any suggestion on this matter.


I have attached the screenshots for your information.


Here is the specification of my computer.


Intel i7-4770 3.5GHZ 4th Gen

EVGA GTX 780 3GB with Nvidia 327.23 driver (newest)

Memory 32GB

Tripple2Go Digital Edition connected with three monitors. (Resolution 3840 x 1024, 60HZ)

Windows 7 64bit


- Hardware

Saitek Cessna Yoke,

Saitek Cessna Trim wheel,

Saitek Cessna Rudder

CH Throttle Quadrant

VRsim M-panel

GoFlight Modules with Goflight PMDG Interface


- Addons

REX Plus with Overdrive

Orbx FTX Global

OPUS FSX (Only Weather)


AccuSim v2

GoFlight PMDG Interface


Thank you for your attention.

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