Drivers monitor 15" northgate modelo VT-5S71 - Northgate (STAX2517C2) PC Desktop

You should have mentioned your Operating System, but I would email or call Newegg, and ask them. http://help.newegg.com/app/home/site/US#ContactUsTab

have you made sure the video cable is plugged into the screen and the back of the computer correctly. You could also try a new video cable, because the problem may be that the wires inside the video cable have frayed. If that doesn't fix the problem you could try using a different monitor and see if you can replicate the same problem with a different monitor, if you can, the computer may have a problem with the graphics card. If you can't replicate the problem with a different monitor, it seems as though your northgate innovations monitor has developed an internal fault, if the monitor is within warranty try and get a free repair or get it replaced (if you have the receipt.

The mic connects to the computer not the monitor. It will work if you connect it to the Mic Input port and have it set right. You may or may not need a driver.
http://www.ehow.com/how-does_4895724_troubleshooting-pc-mic-input.html

1.Drivers are usually given by the manufacturer to work with the latest OS (operating Systems).
Sometime Windows 7 will detect the device and input the drivers it has in it "cab files" but if not present it will prompt you to look online to the manufactures website for updates or it will ask you to run the compatibility wizard .
2. Windows 7 has an option also to run the device in another operating system mode such as Windows XP and may have the drivers stored in the "cab files" for Windows XP for example. If not the manufacturers device will not run in the Windows 7 environment.

More likely to have backlight inverter circuits failure, you need to open it up and look at caps, loose connections, burnt parts, check to see if you do have 12vdc feeding the inverter circuits. 15" monitor may not be worth fixing.
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague

You have to open uo the set and check for 12vdc feeding the backlight inverter circuits, if you do have 12vdc then the inverter circuits may be bad, also look for bad caps. see example of a couple years old failed monitors: http://s807.photobucket.com/home/budm/allalbums

Have you connected a cable (3.5mm plugs at each end) between the mintor and the sound port on the P.C.?

click here this should help.

You need to connect an audio cable from the sound card to the monitor? Once that is connected you should be able to control the sound normally.

Good luck and please let me know how it works out for you!

Most any monitor should work on your system. The only real limitations are the display capability of your video card. Most video cards will display up to a 22 inch monitor without any problem. Here are a couple suggestions

http://www.newegg.com/Product/Product.aspx?Item=N82E16824001268&cm_sp=DailyDeal-_-24-001-268-_-Homepage

http://www.newegg.com/Store/Category.aspx?Category=19&name=Monitors