Originally Posted by aspire.comptech
Open case is probably referring to an Alarm or Alert that will message any time the computer is turned on with the case open. You adjust voltages basically in the same section of the BIOS that you adjusted the FSB. The are usually all together in the same neat little place. Look for FSB Voltage and Vcore or something similar and you will probably have to change Vcore from "Auto" to something closer to 1.4v
You have a rather high VID I think for a Q6600, but I could be thinking in comparison to my Q9450 which has a 1.21 VID.