Monitor will not display

To me this is a hardware problem.

Let's diagnose, and see Shunka_Reid.
Connect a VGA monitor to the laptop.

A) Laptop OFF, monitor OFF, connect a VGA monitor to the VGA port, on the laptop.

http://support.gateway.com/s/notebook/2009/gateway/nv/NV78/NV78lv.shtml

Number 3 - External VGA display port

General example of VGA connector (port), and VGA cable,

http://en.wikipedia.org/wiki/VGA_Connector

Scroll down a little for the VGA cable example.

You can use a CRT type of monitor, (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable.
General example of a CRT type of monitor,

http://www.wisegeek.org/what-is-a-crt-monitor.htm

B) Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.
By factory default settings, the display should show on the external VGA monitor.

IF not;
There are at least 3 display options available;
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor.
3) External VGA monitor ONLY.

Press, and hold the Fn key down, and at the SAME time tap once on the F4 key.
The F4 key is the Display Toggle-Over key.

Still no?
Hold the Fn key down again, and tap on the F4 key once more.

Do you get a good display on the external VGA monitor?
Post back in a Comment.

Also, has the laptop ever been cleaned on the Inside, to your knowledge?

Regards,
joecoolvette

http://h10025.www1.hp.com/ewfrf/wc/product?product=4043282&lc=en&cc=us&dlc=en&lang=en&cc=us

Product information > Product specifications > Product specifications;

External Ports:
1 VGA (15-pin)

Manuals > Notebook Tour - Windows 7;

Left-side Components - External Monitor Port
Left/Rear side of laptop,

http://en.wikipedia.org/wiki/VGA_connector

You can use a CRT type of monitor (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable.

(You can also use an HDTV if it has an HDMI port, and you have an HDMI cable. The HDMI port is on the Left side of the laptop, too.

{Don't buy an HDMI cable that is expensive. Just a waste of money.
Those gold plated parts are just a little bit better, than an HDMI cable that doesn't have it. $20 for an HDMI cable is PLENTY. (12 Feet) I use one's that cost less )

A) Laptop OFF, monitor (External display device) OFF.
Connect the VGA monitor to the VGA port, on the laptop.

Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.

There ARE at least 3 display options available;

1) Internal monitor ONLY
2) Internal monitor AND external display device (VGA monitor in this example)
3) External display device ONLY

Press, and hold the Fn key down, tap once on the F4 key.
(The F4 key is the Display Toggle-Over key)

Wait a few seconds.
Still no?
Hold the Fn key down again, and tap once more on the F4 key.

For additional questions please post in a Comment.
Regards,
joecoolvette

A) Post THE Product Number on the bottom of the laptop. It's in the white Service Tag. P/N = Product Number.

B) On the left/bottom side of the LCD screen frame (Display Bezel), there is a switch. Looks like a small button.

This is the Internal Display Switch. (May not be in this exact position for your model. Look around on the Display Bezel, that surrounds the LCD screen)

When the laptop is closed, the switch turns off the display, (Image on screen), with the computer still on.
Tap it a couple of times lightly, with the eraser on the end of a number 2 pencil.

See if anything happens. That switch may be bad.

C) Laptop off, monitor off, connect a VGA monitor to the VGA port on the laptop.

Example of a VGA cable, and VGA connector, (Port),

http://en.wikipedia.org/wiki/VGA_connector

You can use a CRT monitor, (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable.

C) Turn the monitor on. If a CRT type of monitor allow it to warm up.
Turn the laptop on.

By factory default settings, the display should show on the external VGA monitor.

IF not;
There are at least 3 display options,

1) Internal monitor of laptop ONLY
2) Internal monitor AND external VGA monitor
3) External VGA monitor ONLY

Press, and hold down on the Fn key. At the same time tap once on the Display Toggle-Over key.

Don't know what exact HP laptop you have. For most HP's it is the F2 key, or the F4 key, that is the Display Toggle-Over key.
(Key has an empty rectangle on it, with a vertical line on each side)

Still no display on the external VGA monitor?
Hold the Fn key down again. (Bottom left of Keyboard)
Tap once more on the Display Toggle-Over key

NO display on the external VGA monitor, means you have a bad graphics chipset.

(By using an external VGA monitor, you are bypassing the Internal Display Switch, and the Display Assembly. (Internal monitor of laptop)

If you have a display on the external VGA monitor, you have a problem with;

1) Video Cable, (Display Panel Cable for HP)
or
2) Display Assembly

Post back with your results, and if you have a display on the external VGA monitor, we will go on.

If you do not have a display on the external VGA monitor, you are looking at motherboard replacement.

Post back in a Comment.

Regards,
joecoolvette

Sounds like your screen is going bad or your video card is bad. Try plugging an external monitor to the laptop to isolate the problem. Borrow a monitor from a neighbor, friend, relative or co-worker and plug it into the laptop. if the borrowed monitor displays without the red spot then your original monitor is bad. If the borrowed monitor shows the red spot then your video card inside the computer is bad.

Plug in an external monitor and see if the display shows up on it. It can be any kind of monitor even the old big fat crt monitors as long as it has a vga cable to connect to your computer's vga port. If so that proves your video card is ok. The video will show on most systems when you reboot without you having to do anything. Some systems will require you to hit the FN (Function key) + F1 thru F12. Hold down the FN key then hit the correct key for displaying on the monitor (F1 thru F12). The correct key will normally have CRT/LCD on it or it will have the icon of a display.

install an AGP card into an AGP slot then you can see the high resolution. internal display card does not support to high resolution because of insufficient memory .use 8X AGP card for better result

If you use OS Windows, try this :
Start Menu - Control Panel - Display (double click) - in tab Setting - read this sentences :
Drag the monitor icons to match the physical arrangement of your monitor
Click in the right-mouse on screen 1, click in "Attached". May be you can see LCD. Or, try this : you need monitor CRT of computer. Plug in to slot VGA inside your laptop. And restart your laptop. See in your monitor CRT. If your monitor CRT will see your display and your LCD laptop didn't see anything, it's that mean for your laptop is broken in video display onboard. Replace new one of your laptop mainboard.
Or, press button of 'Fn' and 'F3', will be switched between your LCD laptop or other monitor in your slot VGA.

check that the monitor is indeed the problem, plug the montior into a different pc or laptop and see if it works.

if so then borrow a monitor from somewhere plug it in to your pc and see what happens if it does not produce a picture then check that your graphics card is seated correctly in your motherboard.

also this is where it gets tricky, but if the graphics card is AGP make sure that your bios is set to use the AGP (not PCI) as it's primary or vice versa if it's a PCI graphics card.
(I say tricky because you may not be able to view anything if you don't have or can't borrow a different type of graphics card ie try a PCI one if you have AGP) to do this step you will need to install a spare card.

if you still have no joy but you get the monitor to display something when it is plugged into the different PC, at least you know the monitor is not at fault.

ther's a problem inside that monitor, if you know how to resolder, just resolder whole circuit boar and crt board.

To arrange multiple monitors
This procedure applies when two or more monitors are connected to one computer.

1. Open Display in Control Panel.
2. On the Settings tab, click Identify to display a large number on each of your monitors, showing which monitor corresponds with each icon.
3. Click the monitor icons and drag them to positions that represent how you want to move items from one monitor to another, and then click OK or Apply to view changes.

Notes

• To open Display, click Start, click Control Panel, and then double-click Display.
• The icon positions determine how you move items from one monitor to another. For example, if you are using two monitors and you want to move items from one monitor to the other by dragging left and right, place the icons side by side. To move items between monitors by dragging up and down, place the icons one above the other. The icon positions do not have to correspond to the physical positions of the monitors. You can place the icons one above the other even though your monitors are side by side.

in Monitor CRT Red-Blue-green cathode guns are there.. Mixing of these colour we can get the original colour chrominace technique. if any of the colour gun is faulty we would get more REad or blue or green picture. Measure RGB voltages. you can verfify which gun is faulty. if then check RGB processing circuits. Else there might be problem Chrominance colour decoder system. Contact service centre