I suggest you reset the CMOS.
To do so follow these steps:
1. Flick the I/O switch located on the backside of the Power Supply Unit.
-- If there is no such switch located unplug the power cable
2. Open the system case
3. Search the mainboard for a CMOS battery.
-- If you can not find it or do not know where it is, refer to your mainboard manual
4. Remove the CMOS battery for approximately 10 to 15 seconds.
-- Be extremely careful when working inside your computer take into mind that an electro static discharge may damage components. To learn more about ESD see
this article.
5. Place the CMOS battery back into the holder.
Additional:
If your CMOS battery can not be removed, or you do not wish to remove it search through your mainboard manual for information on how to short circuit the CMOS jumper. The CMOS jumper may not be present on all mainboards.