Firstly would you mind updating your profile which can be found at the top with your location please. It can make it easier to answer if we know where the poster is.
As for your problem I would advise turning off all the power saving settings in the BIOS. C1E, C5, EIST etc and see if that helps. If it does you can either leave them disabled or turn them on one at a time and see what effect they have.