Well, I can't set fan settings under Riva....thats odd...however, I think I had a breakthrough yesterday: I was transferring a song to my girlfriends cellphone via a bluetooth dongle - and hey presto, the computer shuts down! Every single time I start the BT transfer!
Now, any suggestions..?
Did you try the dongle in different USB ports? Does your PC still shut down with the dongle removed while playing Cod4? Does it only shut down while playing Cod4?