No video cam appear in yahoo messenger

Download the manufacturer's software ( by using the CD or from their website )
Once your webcam is working on your computer,you can configure it to Yahoo Messenger.
Its good practice to disconnect and re-connect your webcam before you start - if you have been using it elsewhere the Yahoo software may have difficulty in locating it. Mine, I just unplug it from the USB and plug it back in, if yours is integral with the computer you will have to re-start the computer, unless the software has a feature for this.
Of all the chat programs, Yahoo is the most painful software to set up but if you follow these instructions you should be ok.

INTERNET CONNECTION
Webcam connected
Open messenger - on top toolbar. Left click ( > ) Messenger > Preferences > Connection - Select 'no proxies' or 'connect direct to the internet' depending on the version of messenger you have
make sure your internet connection and country are correct in the lower two boxes > Apply > OK

TESTING
> Messenger > My webcam - the warning panel will launch, click 'OK' and your webcam will start. You should be rewarded at this stage with your happy smiling face.

DEFAULT
With webcam still running > Messenger > Preferences > Webcam > Camera Source - set your webcam as default using dropbox. > Camera Settings - adjust settings to suit. > Apply > OK
Take a note of any additional software, if you have multiple choice for Camera Source, you may wish to uninstall any redundant webcam software later to prevent conflicts

PERMISSION OPTIONS
> Messenger > Preferences > Webcam - make your selections ( who you will allow to view you) > Apply > OK

IN USE
When you are both on line and wish to show your webcam > Actions > 'Invite to view my webcam'. This will launch an invitation on your contacts screen when they 'Accept' your webcam broadcast will start- There can be considerable time lag ( 1 minute) before they see you, so dont be too impatient ( You can check the status on the bottom left of your webcam panel. You can 'drag and drop' the frame to a convenient location by grabbing the top border.
There is a shortcut ( webcam icon ) down by your pic as well
Your contacts needs to configure their connection the same as above or they may get a "webcam not connected" message

If you complete the above and still have problems - check to see if your cam is compatible with Yahoo

YAHOO SPECIFICATION
To find out what the requirements are for messenger webcams, check out the following.
http://help.yahoo.com/l/uk/yahoo/messenger/messenger9/webcam/mstacamreq.html;_ylt=AghoQIvxhmhcugo.AOaNKaokPCV4

Normal 0 See section B. Yahoo Messenger in the info below to setup the Audio & Video.
Also send this to your family and friends so they have their computer setup properly.
Web Camera’s have to be setup on the program they are to be used with. Just installing the camera on your computer does not set it up to broadcast on messengers or Skype.
Each program has Options that have to be setup in order for the Audio and Video to function properly.
A. Skype Setup:
After downloading and installing Skype (http://www.skype.com/intl/en-gb/download/skype/windows/beta/downloading/) set it up as follows:

1. Go to Tools, then Options, and click on Audio Settings and set the Microphone and Speakers to the computer Audio Card.
2. Then click on the Video Settings.
3. The camera if Installed Properly will come up and show a video picture.
4. Then, on the bottom of the page click on Save.

The camera and audio should function properly. Your friends and Family will now be able to see and her to you.
B. Yahoo Setup:
After downloading and installing Yahoo Messenger (http://ca.messenger.yahoo.com/download/ ) set it up as follows:

1. Click on Messenger at the top left and then go down to Preferences and then the Preference Window will come up.
2. Next click on Calling and Devices. In the Calling & Devices on the right and set the Microphone and Speakers to the computer Audio Card or sound device installed in the computer.
3. Just below that, go to the Test Audio section and (in blue writing) click on “Open the call setup assistant” and follow the instructions on the left window.
4. Then after completing the Audio Setup, go to down and click on Webcam it should BRODCSAST and you will see your picture.
5. To Chat, click on MESSENGER and then
6. After make necessary settings, click on APPLY, then OK.
7. Then click on MESSENGER and go to my WEBCAM ready to use.

1. Windows Live Messenger:

http://www.microsoft.com/downloads/details.aspx?familyid=d78f2ff1-79ea-4066-8ba0-ddbed94864fc&displaylang=en

1. After you start Windows Live Messenger, expand the view by clicking on the square on top left next to the red X.
2. Then on the Windows Live messenger window on the right side, click on “ “Show Menus.” And then click on “Show the Menu Bar”.
3. Next go to the Menu Bar on right side, click on “ “Action.”
4. Go to “TOOLS” and click “Audio and Video Setting” and follow the instructions.

NOTE: Your audio and video should work. Enjoy.
When done both the Audio and Video will function properly so you can chat and see family or friends you are connected to.
Hope this helps. Bud