Yes, tried F6, still having problems.
Here is what I'm seeing now. Took out 2 DIMMs and now it boots with 6GB and 2GB hardware reserve. If I power off and power on it comes up normal with all 8GB. But I've noticed if I leave the system off for about an hour and power it up, it will revert to the 6GB/ 2GB hardware reserve. If I want it normal i just power off and on and all 8GB is seen. The same thing is happening with 12GB installed, 2GB is being hardware reserved (intermittantly). I don't think it's a memory problem, cause i power off and on, and no more hardware reserve.
I read a post that suggest the problem is BIOS related not reading the memory SPD correctly at boot.
Could this be the problem?