MarkA, you are running a BIOS version from 2010. According to the download center, there are 7 newer BIOS version that we can update to.
I would recommend you to install these BIOS versions 0251, 0312, and then 0333
0251: Download Center
0312: Download Center
0333: Download Center
The following link will show you how to do a BIOS update. I suggest you to use the F7 method