I've had glitches on my mk3 since a long time running in native screen modes.. blue pixels appear on the screen and the OSD, sometimes randomly sometimes on border of graphics / bands. Occurs on cold start so cannot be heat related? pretty random though, sometimes ok, sometimes worse. My machine is running a 2B motherboard, without any timing fixes on the motherboard, doesn't suffer any other problems so i've not been too concerned about doing any fixes to the motherboard until maybe now. Can anyone give some expert advice on the most likely cause of these blue pixels?