M5A78L-M/USB3 - CPU Fan error.

Ok, my issue isn't a MAJOR one, and help here before helped me diagnose what is wrong, but now I am stuck on a fix!

I'm using an Arctic 7 Pro (rev 2) fan, but the heatsink is too good! The fan doesn't start spinning til the CPU reaches 33 degrees C, however it takes a few minutes to reach this temp, so EVERY time on startup I get a CPU fan error warning. I also use PC Probe 2, so once I get into Windows, I check that and sure enough, it spinning when I get there (or an alarm sounds about 0 RPM on the fan, then 10 secs later it starts up).

Now I know I can stop this annoying Hit F1 to continue start-up in BIOS, however I do not want to do this as Sod's Law will strike and when I get a 'real' computer error, I won't get a message about it.

I'm by no means an expert with computers, however within the BIOS (v. 1103) I cannot find an option to change the CPU temperature at which the CPU fan starts. Is there such an option hidden from me, or is this just a flaw in the BIOS (having no option to change when CPU fan starts), and something I will have to live with?

Many thanks in advance for help with this.