How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask J. Mar Your Own Question

J. Mar
J. Mar, Professional
Category: Networking
Satisfied Customers: 375
Experience:  Over 10 Years experience in an IT Environment. Work experience in networking
Type Your Networking Question Here...
J. Mar is online now
A new question is answered every 9 seconds

my laptop is not recognizing when i hook up my tv with the

Customer Question

my laptop is not recognizing when i hook up my tv with the HDMI.. am i doing something wrong? I have tried going to graphic properties and options on my laptop to swith the main display but my laptop just is not recognizing that anything is hooked up
Submitted: 4 years ago.
Category: Networking
Expert:  J. Mar replied 4 years ago.

Thanks for asking your question on JustAnswer.

 

Common ways to hook up your laptop to TV

 

1. S-Video - This is probably the most common method out there currently because an S-Video cable is cheap as heck and just about every TV under the sun has a S-Video port. You'll have to make sure you laptop is equipped with this port. Remember, there are two types of S-Video cables: 4-pin and 7-pin. Most laptops and PC's are equipped with a 7-pin port, so if your TV only has a 4-pin S-Video port, then this method will not work.

 

2. VGA - If you have a HDTV, then you will be better off connecting using a VGA cable. It gives much better quality than S-Video and as with S-Video, the cable is very cheap. You usually won't find a VGA port on regular TV's though, so this option is if you have an HDTV.

 

3. DVI - DVI stands for Digital Visual Interface with "digital" being the key word there. The digital signal will give a higher quality picture than either S-Video or VGA. Of course, your computer will need to have a DVI connection and your TV will need to be an HDTV. This cord is definitely not cheap, it ranges anywhere from $40 to $80.

 

4. HDMI - Using HDMI will give you the best quality by far. Only a few computers that I know of have HDMI ports, but you can get a DVI to HDMI cable to connect it to your HDTV. HDMI is compatible with DVI.

 

5. Scan Converter Box - This is the last method that I could think of and it involves using a scan converter box, which takes a VGA signal and converts it into S-Video or component video.

 

Video
View Full Image

 

 

 

 

Check your VGA cable. Some cables have only 14 pins, some have all 15. The missing pin is pin 9, in the 15 pin cable. It carries 5V from the graphics card to the screen.

 

Without that 5V signal most LCD and Plasma television screens won't recognise a PC input. The cable that came with your PC most likely only has 14 ins as that is all a monitor screen needs.


This is the probable solution and you can purchase a 15 pin cable at most PC or electronic shops, just check that is does have all 15 pins befiore you buy it. The cheap ones are just as good as the expensive ones unless you are buying 20 foot cable. For 6 foot cable the cheap ones are just as good as the expensive ones.


You seem to indicate the Cable is not the problem because you have hooked up other laptops to the TV.

 

have you set up th elaptop to supply a signal to the VGA?

 

Other Solution:

 

According to Ask-Leo, most laptops built today include an external monitor connection. Most are VGA, but some are starting to include DVI digital video connections instead.

Laptop
View Full Image

The back of my Dell laptop, highlighting the VGA connector.

The 'trick', if you want to call it that, is that they are not enabled by default. You need to take action to send video out that port. Typically, and this varies from laptop to laptop, there is a keystroke that does exactly that.

The
View Full Image

The CRT/LCD selection key on my Dell Laptop

Unfortunately, it's not a simple as turning it on or off.

 

First, realize that in order to enable the CRT/LCD keystroke you typically need to be holding down an additional key; on my Dell it's a blue "FN" key. It operates very much like CTRL or SHIFT, in that you hold it down to enable the blue functions that are printed on the key tops. So in my case it's Fn + CRT/LCD to enable the external monitor.

Second, realize that it's not on/off. Pressing the key repeatedly cycles though a series of combinations. For example, each time you press that key, you may cycle through these combinations:

 

  • LCD (laptop screen) only, the CRT (external screen) is off.

  • CRT only, the LCD is off.

  • LCD and CRT both on, and displaying the same thing on both screens.

  • LCD and CRT both on, but displaying different things - together they form a larger virtual desktop where the LCD might be displaying the right side, and the CRT the left.

When you hit the keystroke, the configuration changes to the next one in the list; when you reach the last, it starts over at the beginning.

 

Your list of configurations or combinations may be different, or in a different order. There is no standard, and each laptop may be different.

 

Third, and this is perhaps most important because it's the source of much frustration, it can take up to 5 or even 10 seconds for each new setting to take. And 5-10 seconds is a long time when you're standing in front of people trying to ready your presentation.

 

After typing the keystroke to change your LCD/CRT configuration, give the new combination at least 5 seconds to take before you decide it didn't work. Be patient. There are several hardware related reasons for this; most typically the time it takes your CRT or projector to 'sync up' to the signal that it's suddenly receiving.

 

The last combination where both your laptop screen and your CRT are on and displaying two different portions of a single virtual desktop warrants a little more clarification.

 

The likelihood of the LCD and the CRT being the same resolution or "size" in pixels is very low. You can see this when you look at the display settings in Windows:

Dual
View Full Image

You can see that while my laptop's LCD is 1440x900, the CRT/VGA output is set to 800x600. While you can often change the resolution of the VGA output, it's unlikely that you'll be able to match the native resolution of your LCD. The result is what you see - a virtual desktop that's not a perfect rectangle. That's something you simply need to be aware of as you move applications between the two for your display.



Edited by J. Mar on 3/11/2010 at 12:46 AM EST

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I am very happy with my very fast response. Eric is very knowledgeable in the subject area. Thank you! RP Austin, TX
< Last | Next >
  • I am very happy with my very fast response. Eric is very knowledgeable in the subject area. Thank you! RP Austin, TX
  • My Expert answered my question promptly and he resolved the issue totally. This is a great service. I am so glad I found it I will definitely use the service again if needed. One Happy Customer New York
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
 
 
 

Meet The Experts:

 
 
 
  • James

    Sr. Network Administrator

    Satisfied Customers:

    1711
    Highly experienced with wireless networks and wireless equipment, LAN and networking protocols
< Last | Next >
  • http://ww2.justanswer.com/uploads/BA/barrenrock/2011-10-19_215925_JamesJAFinal.64x64.jpg James's Avatar

    James

    Sr. Network Administrator

    Satisfied Customers:

    1711
    Highly experienced with wireless networks and wireless equipment, LAN and networking protocols
  • http://ww2.justanswer.com/uploads/Claws224/2009-07-07_063935_Dork_Portrait.JPG Claws224's Avatar

    Claws224

    IEEE Network Engineer

    Satisfied Customers:

    1256
    IEEE, Microsoft
  • http://ww2.justanswer.com/uploads/KN/knelly74/2011-4-14_215651_kevin.64x64.jpg Kevin's Avatar

    Kevin

    LAN/WAN Specialist

    Satisfied Customers:

    1165
    Certified MCSA and MCP Network Administrator with over 20 years of PC experience.
  • http://ww2.justanswer.com/uploads/tealnet/2009-09-26_000218_headshot_64.jpg Eric K.'s Avatar

    Eric K.

    Network Administrator

    Satisfied Customers:

    510
    13 years of desktop, server and network support experience
  • http://ww2.justanswer.com/uploads/CL/clagesolutions/2012-6-27_145545_20120608Geoff.64x64.jpg Mr. Clark's Avatar

    Mr. Clark

    Network Engineer

    Satisfied Customers:

    510
    Computer Business Owner / Former DoD Network Specialist
  • http://ww2.justanswer.com/uploads/MA/matthewpj73/2012-1-20_18729_TWO.64x64.jpg Matthew J's Avatar

    Matthew J

    Computer Support Specialist

    Satisfied Customers:

    397
    12+ yrs computer diagnosis/repair, network infrastructure install and support, IT Administration
  • http://ww2.justanswer.com/uploads/SE/Seashore2011/2011-12-6_33418_111205223015.64x64.jpg Chris L.'s Avatar

    Chris L.

    Support Specialist

    Satisfied Customers:

    384
    Certified Networking expert with over 10 years experience.