Hello Jetson, and welcome to Seven Forums.
You might see if resetting the BIOS/CMOS back to default settings may allow it to work properly afterwards. Double check that you also have the RAM sticks in the same colored slots for dual channel mode as well.
If you have a newer BIOS version available, you might check to see if that issue has been addressed by the new version and flash your BIOS to update it if so.
In addition, you might run Memtest+86
to see if it may find a issue with the RAM.
Hope this helps some,