CPU: Intel Core i7-6700K 4.0GHz Quad-Core Processor CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler Motherboard: MSI Z170A KRAIT GAMING ATX LGA1151 Motherboard Memory: Crucial Ballistix Sport 16GB (2 x 8GB) DDR4-2400 Memory Storage: Samsung 850 EVO-Series 250GB 2.5" Solid State Drive Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive Video Card: EVGA GeForce GTX 970 04G-P4-3975-KR 4GB SSC GAMING w/ACX 2.0+, Whisper Silent Cooling Graphics Card Case: Fractal Design Define R5 (Black) ATX Mid Tower Case Power Supply: CORSAIR RMx RM750X 750W ATX12V / EPS12V 80 PLUS GOLD Certified Full Modular Power Supply OS: Windows 10 Pro 64 bit. Monitor: Dell UltraSharp 24 Monitor - U2415 I was playing Assassin's Creed Syndicate when suddenly the pc froze. I couldn't alt tab or open the start menu via windows key. So I shut it down after waiting for a few minutes. I ended up losing sound and also all of my saved game progress from the past week. (The game started over to tutorial mode.) Downloaded realtek drivers for Windows 10 64 bit. No sound. Did a clean install of Windows 10. Still no sound. Installed realtek driver again. Tried both MSI and Realtek's versions. No sound. Realtek cannot be found in Control Panel or in Device Manager. I use earphones, which do not work from back or front port. Also tried my USB speakers from my laptop. No sound. Sound icon on bottom right does not have an X and appears normal. Sound properties in Control Panel states that there is sound coming out through the monitor (Dell U2415 connected via DVI). When hover the mouse over the sound icon, it states that there is sound coming from the monitor. BIOS is set to optimized default. Under msinfo, this is what I see under Problem Devices: High Definition Audio Controller PCI\VEN_8086&DEV_A170&SUBSYS_F9841462&REV_31\3&11583659&0&FB This device cannot start. What are my options? Thank you.