If you already have a cable, usually it's a hotkey on your laptop. Its Fn+F5 just look for the little monitor screen on your function keys, remember, it's two keys and press them until video is transfered to the Monitor. Usually have to press twice or three times.
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The 9-pin port on your PC tower is NOT a video port, it is a serial data port. All VGA connectors are 15-pin. Hooking up to the 9-pin port will not get you a picture. There should be a VGA port on the PC, or else a DVI an/or HDMI port. You can get DVI-to-VGA adapters that work, but only if the DVI port is an analog DVI, not if it is a digital DVI (DVI-D or DVI-DD).
Connection the monitor depends on the connections you have out of your Toshiba laptop.
The monitor has both VGA and DVI.
If the Toshiba has a VGA out, all you need is a VGA cable available online, computer or electronics store.
If the Toshiba has an HDMI out, you can connect it to the DVI on the monitor with an HDMI cable and an HDMI to DVI Adapter.
You can also use USB out with either a VGA converter or a DVI converter (go with DVI for the better picture). Converters can be found online at Amazon, you may also need a standard male to male DVI cable to use with the converter.
Any contemporary monitor is able to switch analog/digital mode automatically if connection from signal source to monitor is set up properly.
Connect digital output from your graphic card to DVI input of the monitor. Disconnect any other signal cables from monitor and switch on both devices (PC & monitor). Wait a while. Monitor checks its inputs and a activates digital DVI, because it is only one active input on it.
If none picture excluding error message of monitor is displayed, go through these steps: 1) Check whether your monitor is set for automatic input selection. If monitor buttons have no response try to use analog input to activate screen (any picture, desktop background...) and then get monitor menu access by pressing menu button.
2) Find out what connector type has your graphics card in PC. Possibilities are: DVI, HDMI, DisplayPort and some their options. See Wikipedia for connector look if you are not sure. Remember that blue D-SUB (VGA) connectors are analogue and you cannot activate digital mode through analog VGA cable.
3) Use appropriate cable to connect monitor to PC. Example: Your PC has HDMI output. Use HDMi-to-DVI cable. Your monitor input is DVI and common DVI-DVI cable is not suitable in case you have PC with the HDMI. Note that DVI-to-DVI, DisplayPort-to-DVI etc. cables are available. You must buy right one.
Be aware that "Auto" button is inactive in digital mode of monitor.
If it is a dvi monitor then you would need a dvi cable. VGA monitor would need a VGA cable. HDMI monitor would need a hdmi cable. If it is compatible with both dvi & vga and your video card has a dvi output then dvi is a better quality than vga. You can purchase the cable online at a store like cables2go. Hope this helps & please remember to rate my answer. Thanks.