Hi, I know there's lotsa similar qns around and I've tried everything I could but am still confused why its not working. Any kind soul around who is able to help? I don't know what happened to computer, the sound controller is perfectly fine until 2 days ago, There is no sound coming out from the speaker except the error beep sound -.-'' I know it has nothing to do with the speakers 'cos I've switched speakers and still I have no sound coming out. Whenever I've restarted the comp, there'll be an icon that said it had discovered a new hardware and asked me to install it. But I have no audio CD to go with it... I have no idea whats the manufacturer of the sound card cos this is a DIY computer. Under my 'Device Manager -> Sound, Video, Game Controllers', there is a yellow exclamation mark next to 'C-Media AC97 Audio Device'. Below is an information of the system according to Belarc Advisor : Controllers Standard floppy disk controller NVIDIA NForce MCP2 IDE Controller Primary IDE Channel [Controller] Secondary IDE Channel [Controller] Multimedia C-Media AC97 Audio Device Drives 80.02 Gigabytes Usable Hard Drive Capacity 40.69 Gigabytes Hard Drive Free Space ATAPI DVD-ROM 16XMax [CD-ROM drive] ST3802110A [Hard drive] (80.03 GB) -- drive 0, s/n 5LR6R7NC, rev 3.AAJ, SMART Status: Healthy Local Drive Volumes c: (NTFS on drive 0) 52.43 GB 31.87 GB free d: (NTFS on drive 0) 27.60 GB 8.82 GB free Communications NVIDIA nForce MCP Networking Controller Dhcp Server: none responded Physical Address: Realtek RTL8139 Family PCI Fast Ethernet NIC primary Auto IP Address: Gateway: Dhcp Server: Physical Address: Networking Dns Server: Main Circuit Board Board: MICRO-STAR INTERNATIONAL CO., LTD MS-6570 Bus Clock: 133 megahertz BIOS: Phoenix Technologies, LTD 6.00 PG 03/29/2004 Pls help!!! Thanks!