I have big problem with my pc (xp pro). It reboots at random times with no error messages. Most of the times it reboots continuously (10 -15 times!!) before the completion of the startup. I checked the event viewer and it appears to be the same acpi error all the times. '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.' I tried to flash my bios (mb: chaintech 7vjd2) but when I used the award utility, with the bios file in a floppy, it couldn't work. (error: 'source file not found.') What's going to happen if i disable the acpi option? Any other ideas or suggestions? thanx in advance.