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Using external monitor with Vista

I'm trying to connect my laptop to a new TV I bought to use the TV as an external monitor. The laptop is an Alienware Area-51m 7700 and the TV is a Samsung which was just purchased a month ago, and the laptop is running on Vista. The TV only has VGA (or HDMI) input and the laptop only has DVI so I'm using a DVI to VGA cable to connect the two. OK, so that's all the background, here's the problem: When I hook them up Vista detects the new display OK and gives me the option of using the laptop only, TV only or both to display so I chose both for now. When I then go to PC mode on the TV, I get no output and then the TV goes to standby. When I press "Source" again on the remote to waken the TV, I see my laptop's output flash on the screen for one brief second and then the screen goes dark and says "No Signal", then after a few seconds goes back to standby mode. So, any suggestions? Like I said, my laptop detects the display and whenever I go back to PC mode I see the output for a split second, so they're connected, it's just...not working properly. Thanks for any help you can give

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Re: Using external monitor with Vista

The problem with adapters is they dont always pass all information thru,,try changing the screen resolution on the laptop down a little

Posted on Dec 01, 2007

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Hi we just bought a Sanyo LCD42K30, Im trying to connect it to my laptop vi VGA but it wont work, it says no signal. Please help

Try the following procedure:

Turn off your TV and your laptop.
Connect the VGA cable from the VGA output of the laptop to the VGA input of the TV.
Now turn on your TV.
Then select VGA on your TV's onscreen INPUT MODE SELECTOR.
Now turn on your laptop.

The laptop should now automatically detect the TV and display the video signal onto that screen.

If the laptop display is still appearing on the laptop's built in screen, then just wait for the machine to finish booting up completely and then you can try using the FUNCTION keys on the laptop keyboard to switch the display to the external monitor (TV).

Now try holding down the FUNCTION (Fn) key on the laptop keyboard and then push the F5 key at the same time.
If this combination does not work, look at the numbered F keys at the top of the keyboard for one that has a figure of a monitor on it. Then hold down the FUNCTION key and press that F# key.

The exact key combination for switching between the external and built in monitors is different for each model of laptop, so if you still have trouble, try looking in your laptop's owner's manual for the precise instructions for that model. Otherwise just comment back here with your laptop's brand and model number and I will look up the procedure for you.

Please comment back here to this page if you have any details to add, have any questions, have difficulty accessing the links, or just require further general assistance and I will respond as soon as I see it.

I hope that was helpful to you, good luck and take care.


Jun 21, 2011 | Sanyo 42 in. LCD TV


Trying to connect computer to LCD TV and get no signal?


If you are trying to connect computer to LCD TV and get no signal, as a first thing do the following:

Double check cable and connection. If possible test different connections. Try using VGA, DVI or AV, depending on availability on computer and TV.

Ensure that Video drivers on computer are properly installed, and that the video adapter is working properly.

If you are using a laptop, ensure that you do not need to use a function button to enable the external display, this is pretty common on laptops.

If you are using a desktop, go to display properties, find the windows where you get the picture of two monitors, and ensure that both monitors are enabled.

On Vista try also using the 'Identify Monitor' button on Top. It is located on same properties panel as the two monitor, the main Display Property windows. From the same window you can also modify display resolution, as explained later.


If still no luck, then it may be a problem of synchronization between TV and computer, in that case try the following.

  1. Turn off TV.
  2. Disconnect TV power cord.
  3. Restart computer.
  4. With Computer already on, plug back and restart TV.

....If that does not work.

On computer, go to display properties.

First try changing computer resolution. The TV max resolution may not be available on computer. In that case try lowering down to the smallest 16:9 resolution available on computer graphic settings (usually LCD TVs are 16:9), and if that does not work, set resolution to 800x600, just to test (picture proportion will be distorted, or you get squared box on a 16:9 TV).

If that does not work, open Display Properties. In Display Properties access Advanced, and then Monitor settings (XP). On Vista choose Personalize in control panel, then Display Settings, and go straight to Monitor Settings, in there again go to Advanced.

Under the advanced monitor settings you will find a tab called monitor, in there you find the monitor frequency. Try setting this to 50Hz, if that does not work try 100 HZ, that is the output frequency of your TV. If you get unsupported frequency, revert value to normal.


on Jan 17, 2010 | Flat Panel Televisions

1 Answer

I bought the Panasonic 3D Viera TC-P42GT25 wi fi ready tv, and it said in the manual that I can connect my PC to the TV and use the TV as a monitor for my laptop. I bought a wireless keyboard/mouse, and a...

looking at you laptop keyboard, you should be able to find a key that has a small picture of a monitor on it... normally will be one of the F or numeric keys... find this key first, then activate the external display function using that key (maybe by pushing the F key and the Key we found) typically for each time you click to activate that function, your computer will switch between three modes: internal + external, internal only or external only... good luck

Jan 25, 2011 | Flat Panel Televisions

1 Answer

I am attaching a Dell 1530 laptop trunning Windows Vista to this Samsung ln40c550 monitor using a HDMI cable. The TV is new and so far I have it working okay with my cable box (RF in). The tv...

Go to "Sound" from Control Panel, or from right-click on the Desktop and then choose "Personalize" from the menu. Click "Playback" at the 'Sound' app, you should see "Speakers/Headphones" and "HDMI" codecs.
If "HDMI" is there, simply click on it and click "Set Default"
If you don't see "HDMI" right click on "Sound" and click on 'Show Disabled Devices" -- "HDMI" should appear. If "HDMI" is not there, you need to install the HDMI sound driver. HDMI has its own audio driver separate from the audio system of the computer ( Sigmatel, IDT, or Realtek ) . It is incorporated into the graphics card's driver, so first make sure you have the newest version of your graphics card driver. On models with Intel graphics the HDMI audio driver will appear in the Device Manager as "Audio device on high definition audio bus".

Hope this helps.


Jan 03, 2011 | Samsung LN40C550 TV

1 Answer

I connected my laptop to my LCD TV using VGA cable. I changed the mode to VGA external monitor. Image/video appear perfectly fine during start up. but right after windows logged in for like 5 second the...

Easy way:
Press and hold Fn key, and then look at the F1-F10 keys.. Most likely it is F7, and has a picture like a computer screen.
So, press and hold Fn key, and then press F7 (or whatever key it is for your laptop). This will change your "presentation" settings, and thus switch back and forth from laptop screen, laptop screen + external screen (TV), just external screen (TV).

If this doesn't work as you expect, just try:

Instructions for Windows XP:

Open the Display Properties window by:
Start -> Run -> %windir%\system32\control.exe desk.cpl,@0,3
(this is the same window where you can change screen resolution).

There you will see two or more "screens", labeled: 1, 2, 3.

Click on "1", and you'll see:

[X] Use this device as the primary monitor
[X[ Extent Windows desktop onto this monitor

Click on "2", this is your TV.. Mark

[ ]
[X] Extent Windows desktop onto this monitor

Then change the resolution to 800x600.
Click Apply

=> now your TV should start showing you a picture.
You can move your mouse between the laptop screen and the TV screen.

If you want just the TV, you can make "2" to be your primary monitor, by clicking on [X] Use this device as the primary monitor.

Nov 04, 2009 | Haier 42EP24S 42 in. EDTV-Ready Plasma...

1 Answer

Connecting laptop to lcd

You may need to use the S-video cable for video. Make sure video mirroring is disabled on the powerbook. Also, make the external monitor the primary display by dragging the menu bar to it in Displays preferences (Mac OS X) or the Monitors control panel (Mac OS 8 and 9).

Mar 14, 2009 | LG 32LG30 32 in. LCD HDTV

1 Answer

Laptop - Television viewing

Make sure that the laptop is set in to a compatible resolution for the TV set, or the TV set will not respond.

Make sure that the laptop is in the mode to output to the connector for the TV set. Refer to the instructions from the laptop for this.

Check to see of the feature to output to the TV set actualy exists in the laptop. I have seen instances were there is a connection for an external device, but the computer does not have the actual hardware installed to do the job.

Take note that using a TV set as a monitor will not give the same picture quality as a dedicated monitor for a computer.

Jerry G.

May 13, 2008 | Flat Panel Televisions

2 Answers

Using TV as computer monitor

Same problem!!! Inspiron E1505 connected to a year old LG 47" 1080p lcd. My rgb used to work fine, plug and play with my pc. No luck with my laptop though. I've tried setting up duel monitors, updating all(atleast I think all) of my drivers, and rechecking all connections!! Please Help.

May 06, 2008 | Flat Panel Televisions

1 Answer

Using LCD as HP laptop monitor

there is a key on your laptop keyboard that will allow you to switch from built in to external monitor. you need to hit the function key and this one at the same time, this will fix that for you.

(I don't remember which key it is, but it's at near the top left.)

Nov 18, 2007 | Cornea CT1503T 15 in. LCD Television

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