E5: black screen problem with FLV file

give solution.....when i play FLV there is option for pause, stop but black screen.what may the problem .other file plays normal .help me plzzzz
Solved!
Go to Solution.

The only solution is likely to get a newer phone. The Flash player on your phone (and mine) is based on Flash 8, which is several years out of date. Also note it's called Flash Lite, which to me suggests that certain features have been removed. Your FLV file must be trying to do something the player doesn't support.

Similar Messages

White/Black Screen Problems With Flash Player

I have had a problem with flash player since updating it in November. Certain websites such as YouTube and Worldstarhiphop work perfectly while other websites such as Facebook produce black or white screens when trying to play videos. If you attempt to play a video on a website in which you get the black or white screen, you can still hear the audio. While that is annoying it is only a minor inconvenience, the biggest problem is with other websites that require flash. I currently want to run an internet speed test on my computer but I can not find a website that my flash player will work with. The weird thing is that the animation at (http://helpx.adobe.com/flash-player.html) plays correctly.
To fix the problem, I have attempted to uninstall and reinstall flash player. I have also tried changing the settings, enabling/disabling hardware acceleration. I feel like I've tried just about everything and I'm running out of ideas. I currently am using flash version 12.0.0.44 through Internet Explorer 11.0.9600.16518. My computer is running on Windows 7. Does anyone have any idea's on how to fix this problem?

I am having the same problems and have tried all the posted solutions with no positive result, so far.
Similar to above… on all of the web pages on which I am unable to see the flash videos, if I click in the flash window to start the video, all I get is audio playback with a black or white screen.
However… If I move the mouse around inside the flash window, I can see that the mouse pointer still reacts wherever the video control buttons are located at the bottom (although I can’t see the buttons, themselves). And if I click the “full screen” button …. usually in the lower right… my view goes to full screen and the video appears!
I don’t know about everyone else, but my problem appears to be limited to:
Specific websites (facebook, most news websites)… I have no problem with Youtube or the Adobe Test Page.
Viewing video in the embedded flash window on the web page... Opening the video to full screen allows me to see it.
I’ve tried this on several of my problem websites with consistent “success” at viewing videos. It's an annoying solution, but at least I can see the videos.

Problem with FLV file

Hi All
I have an FLV file having video codec svc1 (screen video codec). When I try to playback this file in my media player developed using Flex , it does not play well and jumps regularly after few seconds. For example if I start play this file, playing first few seconds it will jump to 1min., then playing few seconds of video, it will jump to an interval between 2 to 3 min....like that.This happens continously till the file ends.
Other files are playing well in this player.
This file plays smoothly (without any jump) in other media players like VLC etc.
Plz help as I have searched a lot on internet for the solution and have made all efforts in creation of this file and making corrections in my media player but nothing work.Plz provide a solution.
Thanks

The only solution is likely to get a newer phone. The Flash player on your phone (and mine) is based on Flash 8, which is several years out of date. Also note it's called Flash Lite, which to me suggests that certain features have been removed. Your FLV file must be trying to do something the player doesn't support.

Black screen problem and file size

Like others I have been having trouble with importing from iPhoto to iMovie. At times everything works just fine but on my most recent project I have been having a terrible time with the preview screen being black. I have used this discussion forum to try and resolve the problem. I've tried many of the recommedations but the problem continues.
In one thread it was mentioned that file size might have something to do with the problem. I think there may be something to this. I've noticed that any file that is 1MB or less shows just fine in the preview window. Files between 1-2 MB seem to have an erratic pattern of loading and files above 2 will hardly ever load.
Unfortunately I seem to have a lot of photos in the latter category (taken on a recent trip to New Zealand). I'm hoping someone can give me some hints on how to reduce the size of these files in a "batch" fashion. Perhaps via Photoshop?
Also, has anyone else noticed any connection between file size and the black screen problem.
Thanks.
Alice
iMac G5 Mac OS X (10.4.8) iLife '06
iMac G5 Mac OS X (10.4.8) iLife '06

Matti,
Thanks for the reply but that isn't the problem I'm having. I've read plenty about not emptying the trash and have not done that.
The problem I'm having happens before the picture is even put in the timeline. When I click on media, go to iphoto and highlight a picture that I want to place in the timeline I will get a black preview screen with the scrubber arrow running across the bottom. Through a rather tedious process I think I have determined that the problem is related to file size. If the jpeg file is greater than 3MB it will not load. Jpeg files under 1MB load wonderfully. Those between 1-2MB are erratic in whether they load or not.

Not happy with Mac book pro retina because of black screen problem.

I am not happy with Mac book pro retina because of black screen problem. This screen failure appears after one year. I was fan of APPLE now I do no support any apple products. When they expires I will renew them with the other products belong to the other companies.

You are entitled to 90 day telephone support from Apple. Try contacting them.
Apple Support Contact
Apple Support contact - Telephone

How to How to install ATI Radeon HD2600 driver on bootcamp 3.0 windows 7 partition w/black screen problem

Ok....so i've posted this question in a different way, and i gotten several "scratch the surface" answers from people just saying to install "Ati catalyst", or insert the os x dvd and run set up.exe, and update to boot camp 3.1 or 3.2...while these all seem like great suggestions, I am finding myself needing more specific direction or "hand holding" so to speak.....here is the MAIN problem...
The Background/history
I used boot camp (3.0, and i found updates for 3.1 for imac and for windows, but can't find for mac pro, AND they all are ".exe" files which run on windows..which as you'll see is the big part of my problem...So I recently updated my mac pro (with the ATI Radeon HD2600 graphic PCIe card with 10.6.7 from 10.5.8. I created a single partitioned drive to install windows 7 professional 64 bit. The download software function didn't work (Thanks, APPLE for that poor level of support) so have to select the option that i have already downloaded, or have other media with the drivers already on it....i restarted with the windows 7 disk in....
The installation of Windows 7 Pro 64-bit
So the installation of windows 7 seemed to go flawlessly, was able to use my existing 23" hd apple cinema display (so somehow it has drivers that work with the graphics card, or maybe the motherboard's on board video components) and i select english, and install now, custom, blah, blah, blah...installation causes a few reboots, then restarts ultimately back in os x since that is the default boot os i use on this desk top and have to do the "opt" button to select booting in windows....so when i try restarting in windows, now using the actual boot drive on which i am installing it, it ran through another reboot or two, but then after that, my display goes black.... in the communities, the solution sounds super simple... "go download the ATI catalyst for the black screen problem....windows 7 doesn't have device drivers that work with the ATI radeon hd2600...no problem, just go download and install...."
The problem, re-emphasized : I cannot even finish the install for windows, because of this driver problem....i cannot see anything....I have tried to reboot in safe mode, and that then seems to invoke whatever basic drivers that do work, likely through the motherboards onboard video vs the actual graphic card, and the screen works and says that it's wanting to complete the installation, so i'm thinking awesome this is gonna work....and then.. "windows installation was not completed and cannot be completed in SAFE MODE, need to restart, blah, blah, blah" pops up...and forces reboot...so Safe Mode allows me to see, but won't allow me to finish the install of windows 7...and without completing the install i can't run (ranther I DONT KNOW HOW TO) any of the various .exe files everyone is telling me are the solutions to my problem...like update 3.1 and 3.2 bootcamp...they're all .exe files? not sure why, because bootcamp runs in 10.6.7 i thought, but whatever...it needs running Windows to execute...then the ATI radeon hd2600 driver for windows 7 that i downloaded from the site has an installation program that is an .exe file, which needs windows to run... Does this make sense, why i can't just use these fixes, that seem to be the only fixes out there....so can someone school me step by step here (not just the highlights) of how to update bootcamp, and how to install the ati radeon driver without having been able to complete the windows 7 installation because the monitor goes and stays black????
This is so very frustrating for the record...and any substantial help "not just go download this..." would be immensely appreciated.
Some other things i've been told to try that i've tried and nothing seems to happen as i'm told it will....
---I've been told to install the osx dvd and run "setup.exe" - AGAIN...it's an exe file...and 2 - when i put in the os x file it just wants to re install 10.6...so need more help if this is even a real solution to understand how to make it work...
---I've been told to update boot camp to 3.1 and/or 3.2 from 3.0, using Apple Software Update....Well, my software update is saying everything is up to date and there is nothing new to download at all, and when i reverify the bootcamp version it is still only 3.0.2...and again downloading the updates from www.apple.com/support/ for 3.1 and 3.2...all of those are .exe files...need windows to run them...again, refer to the problem described in detail above...
---I've been referred to the black screen on imac early 2011 thread saying it should fix my problem...and reading it it SEEMED like the most promising resolution...it involves creating a boot flash drive for windows 7 and an xml file that sets the imac drivers to auto install during the windows installation..and it got me farther than anything else..but still ultimately ended up in the darned black screen...my assumption is that it's because it's for imac and not mac pro so not ati-radeon specific drivers....ok....that's enough..please...anyone who thinks they can help...your help is desperately needed...thanks so much in advance!

hey Hatter, thanks so much for getting back...so just to be super clear...is there no way to install the drivers using an exe file given my current state? no way to do it with command prompt or something? if can make work with existing card, i'd prefer it...now when you say it's 'toast' how do you mean? it works well with the os x partitions and always has...so i'm not sure i follow, just want to be clear...
Now to your point of starting with only the one drive installed...so i would put that bootcamp drive in bay 1 and disconnect the rest...i'm not totally sure what you're suggesting the effect should be of doing this? just that i'm just installing windows without the bootcamp deal...but if windows 7 doesn't support the ati radeon hd2600, it still will go black screen no? or you're saying it will run video through the motherboard if it's the only bootdrive, and will run all the way through the windows install without trying to switch over to the hd2600? (slrry flr these questions..just really want to make sure i understand what you're telling me..thanks so much for your patience and help by the way...it's very greatly appreciated...your support is priceless!
So now, assuming none of the above is possible...referring now to the ati 5770 that you referred to...you mention it works with 10.6 well, and that windows 7 supports it ...2 questions on that
1) Windows 7 supports" meaning, out of the box windows 7 supports it? or will i have to install drivers still through some update, because again, if that's how i have to do it, then won't work, cuz can't start windows to see anything to install any drivers or run any thing at all...so it would have to just work with initial installation.
2)hardware wise for my Mac Pro 3,1...intel dual quad core xeon, blah blah....will this card work? it's a PCIe and should fit on my board no prob, etc?

Black Screen problem on Acer Aspire 5733Z.

The screen on my aspire stays black on switch on. I am able to use a remote monitor. On the odd occassion whilst using the laptop the screen wil suddenly come on, but does not come on again following a switch off?? I have posted this problem before, but in attempting to thank a subscriber's answer using kudus the solution case resolved ticks showed in error. Therefore I still have the black screen problem. Have tried the suggestion of uninstalling adaptor with no success. Any further suggestion much appreciated.

Barnov,
One of the easiest ways to attempt to rule out a hardware problem........is to save all of your important files to a USB backup drive. And then reset your computer to factory condition. It can be a pain to do something like that, but it can save you hours of troubleshooting.
Your computer should have pre-installed Acer software that allows you to reset your PC. There's several videos on this website and also on Acer's YouTube channel that shows you all the different ways to reset your computer.
You should also make a USB recovery drive too. It shows you how to do that too.

Problems with .ARW files and auto toning

problems with .ARW files and auto toning
let me try to explain this because this has happened in past and never found a way to resolve but i lived with it
now that I have a Sony A7R the problem is more serious
Firstly i take pride it making the picture happen all in camera, i use DRO lvl 5 to get enough light, like when i'm shooting at dusk. DRO its like doing HDR but in a single file, it lightens the darks. in my camera i'm happy with results
but when I upload them to lightroom, they come out near black.
allow me to explain
lets say I import 100 images
i double check my preferences and everything is UNCHECKED when it comes to importing options, there is no auto toning, nothing.
as the images import i see a preview in the thumbnail which looks fine.
i double click on one to enlarge it, hence leave grid view.
for a brief 1 or 2 seconds, i see the full image in all its glory but than lightroom does something funny, it darkens the image
one by one as it inspects each image, if it was a DRO image it makes it too dark.
to make this clear, the image is perfect as it was in the beginning but after a few seconds lightroom for some reason thinks it needs to correct it.
how to prevent lightroom from doing this, i want the image exactly as it is, why must lightroom apply a correction>?
i think it has to do something with interpreting the raw file and lightroom applies its own algorithm.
but here is what i dont get.....before lightroom makes the change i'm able to witness the picture exactly as it was taken and want it unchanged..
now i have to tweak each file or find a profile for it which is added work.
any ideas how to prevent lightroom from ruining my images and just leave them as they were when first detected...
there are 2 phases...one is when it originally imports and they look fine
second is scanning each image and applying some kind of toning which darkens it too much.
thanks for the help

sorry thats the auto reply message from yahoo email.
i've disabled it now
thing is, there is no DRO jpg to download from the camera
its only ARW. so my understanding is when i use DRO setting, the camera makes changes to the ARW than lightroom somehow reads this from the ARW.
but then sadly reverts it to no DRO settings.
because i notice if i take normal picture in raw mode its dark but if i apply dro to it, it comes out brighter, yet when i d/l the image from camera to lightroom, which is an ARW - there are no jpgs. lightroom decides to mess it up
so in reality there is no point in using DRO because when i upload it lightroom removes it.
is there a way to tell lightroom to preserve the jpg preview as it first sees it.
its just lame, picture appears perfect...than lightroom does something, than bam, its ruined,.
what do i need to do to prevent lightroom from ruining the image? if it was good in the first place.

BLACK SCREEN startup with 3 beeps, FREEZES when unplugged, Splash screen freeze, HEAT-UP TO BOOT

BLACK SCREEN startup with 3 beeps, FREEZES when power unplugged, IF IT BOOTS splash screen freezes, OVERHEATING REQUIRED TO BOOT - 0x7B, Event 41 kernel-powe
Issue: One day I unplug the power, the screen freezes and I get frozen music sound. I shut down, start up, I get 3 beeps (1 short 2 long), which indicates a Video failure according to the Thinkpad Laptop beep code list.
How I solve the issue day-to-day: I turn the heat up - I disconnect the battery and hard drive and plug in the power then turn it on. I will wait until the underneath is searing hot with a blanket blocking the fan's flow of air, I mean way hot because any cooler and it won't start. Plug stuff back in, Hard drive first, Battery second, turn off with power button hold, unplug power, replug power.
I turn it on, no beeps, it goes past the first Lenovo screen, then gives me a prompt because it "didn't shut down properly" and continue regular startup. What happens next is the Windows logo appears, and just as the animated windows logo starts to move (you see 2 small colored dots on the screen), it freezes. I see this every time, I know naturally that it means that the laptop is still too hot to go past that point, so I shut it down and try again. After about 5 - 10 tries it will go past the splash screen and into the login area, then it's all fine.
Sometimes when I unplug the power from the back by accident it will freeze. By accident I mean that the connector wiggles it's self out easily. This unplug freezing thing started happening about 1 week before the 3 beep black screen problem started rolling, so I'm putting 2 together.
Errors:
I got a Blue Screen of Death the first time I started it up with the overheating ritual, but I never got it since. It was 0X7B. I ended up changing a setting in BIOS from AHCI to Compatibility Mode, and I passed everything without the BSOD again. I have always had it on AHCI.
I got another Blue Screen of Death about a week ago, but came as it was on already and I had been using it, and said something about disabling Cache or Shadowing in BIOS. I never got it since.
BIOS:
Also, the time was set to 1988 or something in the BIOS.
Event Viewer events found:
1. Kernel-Power, Summary page.
There are critical events for a few things like Kernel-Power, Event ID 41, Task Category (63). There are 19 of them, each day 1 or 2 of them but mostly 1, so this maybe corresponds to my daily ritual.
"The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly."
2. Kernel-Processor-Power - Event ID 37, task category (7)
"The speed of processor 1 in group 0 is being limited by system firmware. The processor has been in this reduced performance state for 71 seconds since the last report."
3. LMS - HCMI - Event ID 2, Task Category: none
"LMS Service cannot connect to HECI driver".
I came across a very sluggish performing control panel for Nvidia before and after this problem, and I tried installing a newer version, which I had to jump through a few hoops to do, like uninstalling first, not just updating. At first it said that the driver wasnt made for the system, or that it wasnt compatible or something, which was wrong. I made it work somehow, but it was still sluggish after install. I rolled it back to an earlier driver, and now it works fine oddly. No sluggish performance / slight freeze window thing going on. No problem at all.
MSCONFIG.exe, Boot Advanced Options: I have tried twice to change this 1 setting, check box "Number of processors" and change to 2 processors, because I do have 2 processors. I have been able to change this in the past, but it does not save the setting now, and I believe this option was selected before I started having problems, and settings did not disappear then.
What could this be. The small round BIOS battery? The video card like everyone presumes? (I.E. the entire motherboard replacement), Software? The wiggly power input area? (Not enough power getting in?), Firmware of some sort? The BIOS software being wrong?
SYSTEM INFO:
Thinkpad T61p 6457-A24, Intel core 2 duo (T7700) 2.4GHz, Intel 120GB SSD 6Gb/s, NVIDIA Quadro FX 570M (256 MB),
Windows 7 64 bit Home Premium (6.1, Build 7601), BIOS Ver 1.00PARTTBLx
Display: 1680 x 1050 (32 bit 60 Hz), Integrated RAMDAC, Main driver: nvd3dumx.dll,nvwgf2umx,nvwgf2,
Version 8.17.12.9688, Date 5/31/2012, DDI version 10, Driver model WDDM 1.1

T61-Elwood wrote:
Laptops of all Brands using Nvidia GPUsmade from 2007-2008 are faulty.
You wont get good Nvidia ones on Ebay/forumes anywhere.
I'd beg to differ on both accounts.
*61 series nVidia-based ThinkPads from late January through July of 2008 are a 50/50 shot, since the old chips were mixed with the new ones. Any machine built in August and later can be deemed "safe".
As for the forums (I don't do feebay) there are people who sell genuine, properly-tested planars. However, these do not come at bargain basement prices, and with a good reason if I may add.
Good luck.
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

MSI 290X LE Lightning Edition black screen problem

I recently bought the above graphics card, only to run into problems with black screen, furmark blackscreens when it reaches just over 70c & games that push the card ie Crysis 3 also causes black screen problems, I'm also sometimes getting desktop corruptions, usually after it black screened.
My PSU is a 850watt EVGA SuperNova G2 so i know it's not that what causing the problem.
rest of my setup as follows
3770K @4.2Ghz
MSI Z77 Mpower
8GB corsair memory
ect ect.
Any idea's as to the cause of the problem?
edit here what it doing I've uploaded it to youtube.

First of all remove any oc. Then list specs more detailed: >>Posting Guide<<

Fifa 12 airplay via appletv, black screen problem

FIFA12 Appletv airplay black screen problem.
Hello, i wanted to play fifa 12 iOS with tv via airplay. But it dint work, i see game picture for half second then tv goes black screen. Audio still working and game i can go to play, but i cant see the game picture. This is very sad because every other game works with tv via airplay. The only game which would be really great with airplay doesnt work :( We tested it with two different tv and two different iPad 3's. And the tv is 40" the other one was much smaller and apple tv is the newest one with newest software.
Has someone else had this problem? is the apple tv problem or maybe fifa 12 have bug or something? i hope we can get this working, iv seen fifa 12 via airplay working very nice in few youtube videos so why it doesnt work for us.
also where would be best place to contact fifa12 makers for this problem.
Sorry for my bad english, it's not my national language.

EA sent me the following anwser:
Please try any the following that you have not tried as of yet:
- Exit the game, then turn off and reset your device. Then try starting the game again.
- Ensure you are running the most current version of the game (check to see if there is an update available for the game through iTunes).
- Access the iTunes Store within your device and download the game again. It may prompt you to 'Buy' the game, but once you click it, it should allow you to download for free since you already paid for it through iTunes. Please note that we at EA have no access to your iTunes account. If you have any disputes, please contact iTunes (Apple) directly.
- Make sure your device has the latest software:
1. Download the latest version of iTunes from http://www.apple.com/itunes
Note: If you already have iTunes installed, open it and select Help > Check for Updates. Then install any available updates.
2. Connect your device to your computer with the USB cable, select your device in iTunes, and click the 'Update' button or 'Check for Update' button. Install the software update if available.

PrE 12. How to deal with black screen "Created with Adobe Premiere Elements trial version"?

I'm really considering purchasing PrE 12 and would like to try it out. (I have another video editing software and would like to try this one.)
When I add video, I get a black screen "Created with Adobe Premiere Elements trial version". When I hit play, I can hear audio, but I don't get any video (just the black screen). Is there a work around, a setting that I can change, or is the trial version supposed to show the black screen?
Thanks,

To help with troubleshooting, some questions so people have more to work with
More information needed for someone to help... please click below and provide the requested information
-Premiere Elements FAQ http://forums.adobe.com/thread/1042180
And, exactly what are you editing?
Codec & Format information, with 2 links inside to read
-read both links in reply #1 http://forums.adobe.com/thread/1270588
Report back with the codec details of your file, use the programs below... A screen shot works well to SHOW people what you are doing
http://forums.adobe.com/thread/592070?tstart=30
For PC http://mediainfo.sourceforge.net/en or http://www.headbands.com/gspot/
For Mac http://mediainspector.massanti.com/

Macbook only boots with black screen along with a load of jargon

--------------------------------------------------------------------------------
I installed a java and an intel secuirty update on my macbook pro after that i etsrated my mac and it was then taking ages to boot back up and then afte a while a black screen appeared with a load of jargon on which said the following
Launchd:com.apple.ni.blindd: Exited abnormally: Bad system call
Launchd:com.apple.ni.blindd: respawning too quickly! throttling
Launchd:com.apple.ni.blindd: 3 more failures without living at least 60 seconds will cause job removal
Launchd:com.apple.ni.blindd: will retart in 10 seconds
mDNSResponder-108.6 (Jul 19 2007 11:41.28)[153]: Starting
Launchd: com.apple mDNSResponder: exited abnormally: Bad system call
Launchd:com.apple.mDNSResponder:Launchd:com.apple. syslogd: exited abnormally: Bad system call
Launchd:com.apple.mDNSResponder: 2 more failures without living at least 60 seconds will cause job removal
Launchd:com.apple.mDNSResponder: will restart in 10 seconds
Launchd:com.apple.syslogd: exited abnormally: Bad system call
Launchd:com.apple.syslogd: respawning too quickly! throttling
Launchd:com.apple.syslogd: 2 more failures without living at least 60 seconds will cause job removal
Launchd:com.apple.syslogd: will; restart in 10 seconds
Launchd:com.apple.KernalEventAgent: exited abnormally: Bad system call
If anyone can make sense of this or has had happen before. any ideas on what it means and help on solving this problem
Thanks

Hi Spongeofthedead
did you get this problem solved, my macbook is doing exactly the same thing!!
all the disk repair etc does not seem to work..
i think i ve killed it any help would be very much appreciated..
cheers
gt

Some snaps show up as black screens when I try to view them as single pictures.Even when I run them in slideshows they show up as black screens.These are jpeg files.How can I avoid this happening?

Some snaps show up as black screens when I try to view them as single pictures.Even when I run them in slideshows they show up as black screens.These are jpeg files.How can I avoid this happening?

There are several possible causes for the Black Screen issue
1. Permissions in the Library: Back Up and try rebuild the library: hold down the command and option (or alt) keys while launching iPhoto. Use the resulting dialogue to rebuild. Include the option to check and repair permissions.
2. Minor Database corruption: Back Up and try rebuild the library: hold down the command and option (or alt) keys while launching iPhoto. Use the resulting dialogue to rebuild.
3. A Damaged Photo: Select one of the affected photos in the iPhoto Window and right click on it. From the resulting menu select 'Show File (or 'Show Original File' if that's available). Will the file open in Preview? If not then the file is damaged. Time to restore from your back up.
4. A corrupted iPhoto Cache: Trash the com.apple.iPhoto folder from HD/Users/Your Name/Library/ Caches...
5. A corrupted preference file: Trash the com.apple.iPhoto.plist file from the HD/Users/ Your Name / library / preferences folder. (Remember you'll need to reset your User options afterwards. These include minor settings like the window colour and so on. Note: If you've moved your library you'll need to point iPhoto at it again.)
If none of these help:
As a Test:
Hold down the option (or alt) key key and launch iPhoto. From the resulting menu select 'Create Library'
Import a few pics into this new, blank library. Is the Problem repeated there?

What is the technical 'cause' of the infamous iMac black screen problem?

Can anybody shed some light on what technical malfunction exactly causes the infamous iMac black screen problem? The common solution seems to be a logic board replacement. But what exactly is broken on the logic board? Is it the Geforce chip? Some kind of external driver circuitry? Or something completely different?

I was referring to the many problems also described in this thread (and also in many other places):
http://discussions.apple.com/thread.jspa?threadID=196774&tstart=0
In specific I am referring to machines where all of this applies:
- internal monitor stays black after power-on
- computer boots normally
- external display works normally
- internal display backlight works and can be adjusted in brightness, but all pixels are black
- PRAM reset doesn't help
- NVRAM reset doesn't help
- PMU reset doesn't help
- reinstalling OS / booting from CD doesn't help
- machines with this problem sent to repair come back with a replaced logic board
I'm looking for more information on the technical cause of the exact problem as stated above. So I can attempt to repair my iMac

E5: black screen problem with FLV file

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