After upgrading to 8.1 I had a few problems with hardware, Nvidia etc. I have fixed all of them except that I can't get the internal mic. to function. (or an external one) I have done ALL the obvious things in control panel, device manager says it's functioning properly. I have been on the phone with ASUS support several times about this issue with only temporary help. After re-installing the latest driver the mic will usually work for an hour or two and then stop. ASUS says I either need to revert to 8.0 or wait until there is an update that will possibly fix it. I am wondering if I should update the BIOS which is currently version 207 to 208. Anyone have a clue if this may help? Thanks