Hello, I've been searching for and issue like mine but I can't seem to find anything else like it. On my Asus K53SD laptop I upgraded from windows 7 that it came with to windows 8. But this issue was on windows 7 as well I thought it might've been fixed in 8 but its still here. If I try to plug in a pair of headphones once the pc is on they're not detected, I don't see them under the playback devices and the headphones have no sound whilst plugged in. But if I plug in headphones while the laptop is off they work fine, and the audio correct switches between speakers or headphones but they're still not under the playback devices. I've tried diferent audio drivers for my laptop from asus's support/driver website but to no avail.