Possible to connect an external monitor to HP Pavilion dv4t-4200 CTO Entertainment Notebook PC

I have a HP Pavilion dv4t-4200 CTO Entertainment Notebook PC model # A1M02AV and it has a VGA port, one that looks like a phone/broadband cable port, and one that looks like a USB port but indented on either side at the bottom. Can I even connect an external monitor? How do I find out if I have more than 1 video card? Besides the usual USB/headphone ports, I don't have any other ports. It says my drivers are up to date...but I don't even know what I should be looking for. Do I need to install something or buy some sort of adapter? 
I am trying to connect a Dell external montitor via the VGA port with a VGA cable. The monitor has power but my notebook does not recognize/detect it. However, when I first plugged it in, my notebook display shrank into a square (vs the whole screen) so it recognized something...but nothing happened on the external monitor. 
I tried detecting it via my display settings, but  I accidentally changed some dispaly setting so that the home desktop only shows on monitor 1, but unselected my actual notebook display or something or changed it to be monitor 2 (even though monitor 1 does not exist), so when I plug the cable in to my notebook, all of a sudden my desktop goes away and it's a just a blank background screen - and I cannot access the computer display settings or anything.... when the cable is unplugged this setting looks normal, so I can't figure out how to fix it. 
Sorry, I have no idea what I'm doing here - please help! 
This question was solved.
View Solution.

Hi,
All Dell monitors come with CD's for drivers. Your laptop may not know the monitor w/o its driver, it won't install automatically. Please check:
Ringht click a blank space on desktop,
Click Personalize
Click Display
Click Change display settings
Can you see BOTH laptop screen and external monitor in there as shown on the following image:
For testing, I put my Dell monitor is my main display. If I can't see 2 monitor, you need its driver first and then check the cable.
Regards.
BH
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