Oh dear. I know we're talking about a black screen here so I'll try to be as detailed as possible.
Here is the problem:
Computer turns on. Vaio display lights up like it's supposed to. Then a screen with a blinking "_" shows up, like it's going to write a script, and then the light of the screen goes off. After this, you can see my computer thinking and booting through the little orange CPU light. Then the three caps, number lock, scroll lock buttons flash. Then my computer boots up with the screen light still off. Pretty Windows sound...and we're at this darkened desktop as if it's on minimal battery settings.
What I've tried:
Funny thing about this is you can still see all the activity on the screen if you look at the screen at the right angle. I can see spy sweeper...and my AVG updates. If I hit Windows on the keyboard I can bring up the menu. The light is just off, almost as if my battery has been unplugged...only my battery is in. I have tried adjusting my power management options, I have tried increasing the brightness, I have tried waiting patiently. I have tried restarting in safe mode and other modes. I have tried to see if there were any other refresh rate options...but i'm locked into 60 hz.
What sometimes fixes it:
One thing I've noticed that may trigger this behavior is not having my computer plugged in when I turn on my computer. If I turn on my computer without having it initially plugged in, even if I plug my computer in later after booting, the screen will still be dark. Once in a while, my screen will light up again if I switch the outlet that I'm using to plug my computer in. What outlet I switch it to seems to be arbitrary. It's just the act of switching outlets that seems to do the trick.
Last week after I had gotten the light to work, I would work a little while on my word processor and the light would go out for about a minute, then turn back on.
I'm really worried this is a hardware problem. I've done everything I can with the settings. I would appreciate any help I can get.
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Re: Screen light off
Back light has failed or the inverter or connector come loose.
A repair shop job, unless you are up to taking it apart to check the inverter connector from screen to body of the computer
Is it exposed or concealed in the hinge?
If exposed try a little wiggle.
But repair shop I reckon
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Please explain in detail what happens when you turn the computer on. Do you hear the fans come on? do you hear the hard drive trying to boot? please give me more details and I will try to diagnose the screen issue. Oh and just in case here is a link to the owners manual. http://www.manualslib.com/products/Hp-Pavilion-Dm4-2180-2341384.html
Look for your computer's monitor settings, then adjust its refresh rate. To modify a refresh rate on Windows, right-click anywhere on the Windows desktop. Select "Properties," then choose the "Display Properties" tab on the window that appears.
Click the "Settings" option, then select "Advanced" from the window that appears. Choose the "Monitor" tab, which lets you access a drop-down menu with the options for refresh settings adjustments. As a basic guide, use a setting of at least 75 hertz.
Confirm the change by clicking "Apply." Reboot the PC to ensure the new settings on the screen take effect. Check your screen if the blinking problem is resolved. If not, try a higher refresh setting. If there is no change on the flickering of the screen, this means the problem is not caused by the screen's refresh rate. If your computer is not running on a battery or surge protector, shut it down to safely transfer the plug to another outlet Hope this helps.
Has the screen got a built in supply? doe's ot have a direct mains connection? If the screen has been tested and works by a bench technitian they will have used a bench supply. It might be worth trying a different PSU.
Could be bad ram,hard drive or possibly a bad display panel or video card.Try using different ram and removing the hard drive then try it.Also,connect it to an external display and see if it shows video or not.If after trying these things it still isn't showing let me know and i'll try to help more.
The easiest and most foolproof method for testing your LCD screen is to
hook up the laptop to an external monitor. If the video output on the
external monitor looks fine, this means that the problem is with the
video connector, with your LCD panel itself, or with the circuitry that
turns on the LCD.
What do we do? It all starts with
disassembling the notebook. Find the video connector on the system
board (if the video is integrated on the motherboard) or on the video
card that is attached to the motherboard. Try re-connecting the cables.
You may as well locate the display connector on the back of the end LCD
panel. Re-seat that one too. This way you can be sure that the problem
is not related to connections. Every now and then the switch located
on the system board that turns the backlight of the LCD on and off can
become stuck. If this is the problem then your LCD never powers on.
There's a little switch that detects whether the screen of your
notebook is open or closed. That's the one we're talking about. Try to
push it down and hope it gets unstuck.
Disassembling the laptop
to unstick this switch is an option, but sometimes you can get away
with not taking it apart. Try lightly hitting that plastic switch. But
wait, this isn't the only possible cause, unfortunately. Re-seat the
other connectors and cables that are present around the LCD panel and
the video on board (including the inverter). All of the
aforementioned can usually be fixed, but let's not forget about the
screen itself. Sometimes the screen can become defective. Here we'll
enumerate a few scenarios where the screen has gone bad and must be
replaced: lots of vertical lines or bands appearing on the screen; half
of the screen works fine but the other half stays either black (blank)
or really white; the output on the screen looks blurred and changes to
different patterns; and so forth. These are almost always signs of a
defective LCD panel.
However, if the output on the screen is
nothing but garbage, such as incorrectly placed special characters,
shadows around the characters, unknown randomly placed marks of
different colors, distorted or ugly-looking geometric patterns, or tiny
little white dots all over the screen, then these are almost always due
to the system board or the connection between the LCD panel and the
video card. Re-seat the connectors.
All in all, these are some
of the most common hardware failures. Nevertheless, before we finish
this part, let's name some of the others that will be covered in the
second segment of this guide, along with the promised system
instability troubleshooting strategies. These include clicking noises
coming from the HDD, which is the well-known symptom of a dying HDD.
Thus, back up your important data as soon as possible and order a
replacement. Overheating is also discussed thoroughly.
Can you hook up an external monitor to it and see it just fine there? If so, then one of two possibilities: Either the LCD inverter is bad, or the screen itself is bad. Oh, it could be just a loose wire from the screen to the motherboard also.
When you say ?it turns on fine? I?m assuming that the power and hard drive LEDs turn on. If that is the case it could be your LCD backlight giving you problems. With the computer on and the monitor power LED green shine a flashlight in the lower left hand corner of your screen. Look for the ?Start? button, if your backlight is not working you?ll see a faint ?start? button if you look closely. This is usually an economically repairable problem but not for the typical home user. Let us know if you have any other questions and please don?t forget to rate this posting.