I checked under my Event Viewer and find that there are a series of error coming from ACPI. Details as below:- Source: ACPI Event ID: 4 Description: AMLI: ACPI BIOS is attempting to read from an illegal IO port address (0x71), which lies in the 0x70 - 0x71 protected address range. This could lead to system instability. Please contact your system vendor for technical assistance. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. What is this all about and how can I resolve it? Pls advise. Thanks.