I just got an Intel D865PERL for Christmas.
On the motherboard itself, is a jumper setting that is 3 pins.
1, 2 and 3. The illustration below shows the normal configuration. On mine, in order to get into the configuration (BIOS), I have to place it on 2 & 3. After I adjust all the settings in the BIOS I want, and select "Exit And Save Settings", The Intel BIOS will prompt me to turn off the system, and replace the jumper back on pins 1 and 2. Your motherboard may be similar.