Computer detecting generic non pnp monitor (that doesn't exist)

My computer keeps randomly (usually after a few hours of being on) detecting a third monitor. When I right-click and go to "Screen Resolution" the third screen (or second depending on if I have my second monitor, a Dynex television, plugged in via HDMI cable)
is detected but blank and I cannot make the system get rid of it.
It will get rid of it for a second and then it will come back, making that boo-doo, bud-dunk sounds (the same as wehn you plug in or unplug a usb device). I have tried reinstalling the latest drivers through "screen resolution"-"advanced settings"-"properties(for
both the monitor and the adapter)"-"install latest driver". I've also treid to install the drivers from the AMD website and the HP site. Nothing has worked. 
I called my warranty people and they said to do the same thing, and when it didn't work they said to just reinstall windows. So I did that and it worked, for about two weeks. Then it happened again last night.
I have Radeon HD 6750 graphics card, dual core (Radeon HD 6620G for other half?)
I'm a tech noob so if you need more information please let me know and thanks anyone and everyone for their help :)

Hi,
I suggest you uninstall the monitors in Device Manager, and then scan the hardware changes to see how it works.
Also, try to remove the display profiles for a test:
1.   
Click Start, and then type Color Management in the Start Search box.
2.   
Click Color Management under Programs.
3.   
In the Color Management dialog box, click the Devices tab, and then click the display that is experiencing the problem. For example, click Display: Generic PnP Monitor.
4.   
Make sure that the Use my settings for this device check box is selected.
5.   
In the Profiles Associated with this Device list, remove all the profiles that are listed in the box. To remove a profile, select the profile, and then click Remove. When
this process is complete, the box will be empty and all the defective profiles will have been removed.
6.   
Click Close.
Alex Zhao
TechNet Community Support

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