|Tell us the make and model of your brand name system, or if you have a generic desktop system, the make and model of the mboard. |
The specific model of a brand name system is often shown on a label on the outside of the case somewhere, or it can often be determined by going to the brand name's web site and loading a program they have available, if Windows is still working, on the subject computer.
If it's a Dell computer...
Go here for how to find the Service tag "number":
Tell us what it is.
If it's a HP or Compaq computer.....
Scroll down a bit.
Look for the similar label on the outside of your computer.
Quote the specific model number - that's at the end of the first line.
Quote the Product number - that's on the third line.
The model, sometimes the make, of a mboard in a generic desktop system is usually printed on the mboard's surface in obvious larger characters, often between the slots.
The model is often also displayed on a logo (graphical) screen early in the boot, but it's often not as specific as the specific model number.
Not all computers support connecting two monitors to them.
There must be a VGA, DVI, or HDMI video port for each moniitor.
In some situations, you may not be able to use a DVI port and a HDMI port at the same time - you can use one or the other, but not both.
What type of ports are you connecting the monitors to ?
Some newer mboards have onboard video that has a DVI-D port, NOT a DVI-I port, that DOES NOT support using a standard DVI to VGA gender adapter with the DVI port to get video on a VGA monitor.
Windows enables only one display by default. You have to change settings in Display Properties to get video on other monitors, but of course you must have normal video on at least one display in order to be able to do that.
Are you connecting the second monitor to a video card installed in a mboard slot that you have just added ?