Hi, my VGN-AR61E does a random (not too loud) tick noise, coming from the speakers. Sounds like the (silent) start of a vinyl record. (crackle, hizzz) The "noise" can be heard for less then a half second. On 8 hours of using the Laptop, the "noise" usually appears 1 or 2 times. It did not appear on Windows 7 x64. Im also 98% sure I was using Sigmatel Soundrivers back then. Those do not play any sound on win 8.1 pro x64. Device Manager has 2 times "High Definiton Audio Device" now. (it has optical out) HDAUDIO\FUNC_01&VEN_8384&DEV_7664&SUBSYS_104D2200 (conexant/realtek) (Sony's Sigmatel/IDT HD Audio 6.10.5921.0 driver compatible) HDAUDIO\FUNC_01&VEN_10EC&DEV_0262&SUBSYS_104D2200 (abit/realtek) Google didnt really reveal any "solutions". I dont really see it as a problem (Yet), but Id like to know whats causing this "tick" and how to fix it. Maybe someone else experienced this ?