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Nov 12, 2012 - ... the mounting arm of my Chimei CMV 222H monitor, can you getreplacement arms? The locking mechanism - Chi Mei Corporation CMV-222H 22 inch LCD Monitor question. ... Video; Photos; Link; Replacement Parts. Add.
If your "computer" is what you have posted, it is not a computer at all, rather it is a monitor. Here is the manual for the monitor in question http://support.dell.com/support/edocs/monitors/E153fpb/En/index.htm it does not have a built in microphone, however, if you were to provide me with the computer type, the computer might have one. Or, if you told me the Operating System (Windows XP / Vista / 7) I could also tell you how to find out if the computer comes with a built in microphone.
In short: What you have requested information on is not a computer, and it does not have a microphone.
Sounds either a backlight problem (inverter or tube light) or the display interface.
Since you have confirmed that it is your LCD monitor, your best bet perhaps is to seek the services of a qualified professional.
Should you venture in doing it yourself (DIY), You need to open up the casing. A step by step procedure is better illustrated here .
The working principles of notebook/laptop displays are nearly identical to your LCD.
Hope this be of some help. Post back how things turned up or should you need further information.
Good luck and kind regards.