My laptop's sound went dead. It has a white "x" in a red circle on the speaker icon. My sound icon is saying "No audio output device is installed." If anyone can help me fix this problem, it would be appreciated. This my my laptop: Microprocessor 1.9 GHz AMD Turion 64 X2 Dual-Core Mobile Technology TL-58 Microprocessor Cache 512 KB + 512 KB L2 cache Memory 2048 MB DDR2 (2 Dimm) Memory Max 4096 MB Video Graphics NVIDIA GeForce Go 7150M (UMA) Video Memory Up to 559MB Hard Drive 160 GB (5400 RPM) (SATA) Multimedia Drive LightScribe Super Multi 8X DVD±RW with Double Layer Support Display 15.4" WXGA High-Definition BrightView Widescreen (1280 x 800) Fax/Modem High speed 56k modem Network Card Integrated 10/100BASE-T Ethernet LAN (RJ-45 connector) Wireless Connectivity 802.11b/g WLAN Sound Altec Lansing Keyboard 101-key compatible & 2 Quick Launch Buttons- HP Quick Play Menu and DVD Pointing Device Touch Pad with On/Off button and dedicated vertical scroll Up/Down pad PC Card Slots * 1 ExpressCard/54 Slot (also supports ExpressCard/34) External Ports * 5-in-1 integrated Digital Media Reader for Secure Digital cards, MultiMedia cards, Memory Stick, Memory Stick Pro, or xD Picture cards * 3 Universal Serial Bus (USB) 2.0 * 2 Headphone out * 1 microphone-in * 1 VGA (15-pin) * 1 TV-Out (S-video) * 1 RJ-11 (modem) * 1 RJ -45 (LAN) * 1 notebook expansion port 3 * 1 IEEE 1394 Firewire (4-pin) * 1 Consumer IR My sound icon is saying "No audio output device is installed."