Hello everyone, I have been trying to fix this random problem on my computer and I haven't been able to find any solution . The only explanation that I can find is that startup got interrupted and something got screwed there, I haven't changed anything to the computer, no recent updates. My computer: QuadCore Intel Core 2 Quad Q6600, 2400 MHz (9 x 267) 2GB RAM VISTA64 Motherboard: Intel Dragontail Peak DP35DP (2 PCI, 3 PCI-E x1, 1 PCI-E x16, 4 DDR2 DIMM, Audio, Gigabit LAN, IEEE-1394) NVIDIA GeForce 8400 GS (512 MB) Intel 82801IB ICH9 - High Definition Audio Controller [A-2] I tried: - Reinstalling the drivers from the CD, it tries to install, and then says the device isn't present. - Donloading drivers from Intel, same. - Enabling, disabling on the BIOS, doesn't make a difference. - Device manager doesn't even list any audio devices, when prompted to detect, can't find any. System info cannot detect any either, but Everest tools does detect it. I would appreciate any help... this is a strange situation because I had the same happening on an HP laptop, no solution there either. Would a different OS make a difference? I am also thinking about buying a cheap PCI sound card, would that fix my problem? Thank you in advance!