OC'ing CPU causes comp to reboot and reset to defaults.

my cpu: intel core 2 duo e8400
motherboard: gigabyte ep35-ds3l

so when I try to oc my CPU, after the comp starts up it gets past the bios screen but then reboots itself, returning all the bios settings to normal again. i noticed that it does this no matter what GHZ i have the OC set at. if I just turn the setting from auto to Manual (the setting that u change to enable OC) then it will do this. ive tried resetting CMOS doesnt do anything

how do i fix?e
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More about comp reboot reset defaults
  1. The first step you test your ram with software memtes86+. only health test ram worry if there is an error this is usually the main cause of overclocking settings can not be stored properly in memory bios!
    also check the battery on the motherboard might not be able to support IC bios.
  2. Obviously, your settings are not stable.

    This should be your first stop.
    Core2 Overclocking Guide

    Shadow's Gigabyte motherboard OC guide:
    It's for an EP35-DS3L.

    Go through the guides. Then take your core voltage off Auto and set your memory voltage to factory recommended values. Change the System Memory Multiplier (or whatever your BIOS calls it) from AUTO to 2.00, 2.00B, or 2.00D - whichever you need to set the Memory Frequency to twice the FSB. Then when you increase the FSB, the memory clock will rise in in proportion with it. At an FSB of 333 MHz, your memory clock should be at 667 MHz.
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