Okay here is the thing, on June 3rd, my audio stop working. I try to fix it but no matter what I did I couldn't get it work. On June 5th, my audio start working again. It kept working till June 10th when I had power blackout which cause my laptop to have improper shut down cause I had the battery out. I did system restore back to June 3rd and my audio problem start working again but then on June 14th, my computer overheated and had improper shut down which cause audio problem to happen again. I can't system restore the computer again cause the june 3rd restore point is no longer listed even after I click on showing restore points older than 5 days. Since then my audio has not been working. There is an x over the audio icon on taskbar which says no audio output device is installed. I went to device manager and realize that sound, video, and game controller is missing. I scan for hardware changes but it doesn't appear. I click show hidden devices and look at other devices folder but the only thing listed there is a keyboard filter. I check to see if there is yellow mark on all devices but nothing. I check windows audio (automatic), I check on-board audio (enabled), did windows and hp update, (up to date but audio problem is still there), did a driver recovery and re-install the driver that came with computer (still have the audio problem). I even went on add hardware and added another driver (realtek audio driver). I had my sound, video, and game controller folder back but the device had code 10 error. This device cannot start so I uninstall the device then the sound, video, and game controller disappear again. I try to use microsoft fix it program and it say that I do not have Speakers (Conexant High Defintion SmartAudio 221) SPDIF Interface (Conexant High Defintion SmartAudio 221) I went on the internet to look for the driver and I found it HP site. I download it and try to installed it but it say I already have following file on my computer when I try to overwrite it, install halfway but then towards the end, it told me access denied. Then a pop up shows up, saying that driver installation failed: could not find the device for this driver. I am running out of ideas on how to fix it. I went on programs and features, and I see that I have conexant hd audio and hdaudio soft data fax and modem with SmartPc installed. My computer is old. It's a HP Pavilion dv2740se Entertainment Notebook, Windows Vista 32-bit, Service Pack 2. My sound card is in-built. I thought it might be broken but the computer makes a beep noise whenever I have computer pop up like whenever it is asking me to confirm if I want to install a program or if I press the backspace too much. I am not sure if that means the sound card is okay or not. Is it? Any ideas on how to fix my audio problem?