Sometimes there is an option within the BIOS to change the delay time between the computer switching on and when it tries to access the hard drive - I have had this problem before where the computer tries to access the drive too early and ends up resetting (for some unknown reason!) and altering this setting generally worked for me, tho I've not had any experience with your particular motherboard. I would also suggest checking your PSU - a faulty or low powered PSU can also cause the same problem, altho this problem seems to be rather rare.