Sometime Display not working

Hi,
I bought new Mac Pro and last few weeks facing a problem with my display (27" LED). Specially morning time, when I switch on computer, after bing sound.... display don't show anything.... just black screen, desktop light on and I can hear a little sounf of hardisk that its working but diaply full black. When I do restart then display works and it shows.....!!!
Please guide and your suggestion will be appreciared.
TIA.

It is, OP said, brand new! It does not need a can of air (and compressed air isn't the best way).
Sounds like a hard drive (or SSD for system?) is taking too long... try SAFE BOOT as well as repair from Lion Recovery.
It may be looking to boot from another drive or can't find one or a network location?
you could use Lion Recovery Mode and/or Option
And always keep a bootable backup clone system drive handy.
It shouldn't even need to Reset SMC or zap PRAM (though that is what most people would turn to and try).
Can assume is has ATI 5x70 but what monitor is connected, and thru DVI or not (or more than one?)

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Caller display not worked since June 2014

On 26/06/14 I reported a fault (VOL-**********) that the caller display function had stopped working following a thunderstorm in the area. According to the fault status this fault is showing as being corrected and closed on 02/07/14 when in fact the fault still exists. I tested the line using the BT test socket with a new BT2000 phone and this displayed ‘incoming call’ therefore my internal wiring is not part of the problem. I have also dialled the test code *#234# to check if the caller display service is available and confirmed that it is. I then tested the new BT2000 phone on the neighbour’s telephone line and this showed the caller ID for incoming calls, as did my other telephone as well; therefore none of the telephone handsets are at fault. Three times BT have informed me that the fault has been fixed and yet I still have no caller display. Reading through the forums it would appear that other people have encountered similar issues and that the problem is at the exchange, “An Openreach engineer discovered that the RS232 burst transferring the CLI number up the line was too weak and he then went down to the exchange to investigate. He then discovered that the fault lay in the ADSL device which lies between the analogue exchange equipment and the outgoing line”.
I’m surprised to see that BT are taking so long to trace a fault in their system last raised 5/8/2014 (VOL012-**********) and that they haven’t sent an engineer to the property or to the exchange to check the problem.
My patience is wearing thin over this problem with my Caller Display not working as it started in mid June. I’m also becoming less enthusiastic about BT and find it harder to recommend them to others.
My last message from BT, tells me that it should be back to normal on the 8 August. However, it is still not working. Their message that my phone should be back to normal now and if it isn’t report this to BT, is ridiculous. If an engineer had investigated what was causing the fault and found it, then he would have fixed it. However, either an engineer has not investigated the fault or BT is not competent in fixing their own service faults and makes these statements with crossed fingers?

An engineer called yesterday and told me that he had been asked to test the line for a voice fault not a Caller Display fault. However, his testing revealed there is no line fault, CLI signal is strong and he was happy that the new BT2000 phone (bought after the lightning strike) is working properly. (This phone had also been tested on a neighbour’s phone line where it displayed the callers number). He also found that this same BT2000 phone on my line was not displaying the Caller’s number (CLI), but couldn’t offer any reason why.
I conjectured with him that these tests must bring the problem down to a corrupted CLI signal which does not allow the phone to understand the phone number being sent.
When the lightning struck the phone line back in June, it blew the telephone connection in the back of the Sky Box with a flash and bang (telephone cable now removed from the Sky box). It shorted the Openreach Faceplate (now replaced) so that the phones and broadband stopped working and it caused the phone to light up and react as it does when a call comes through.
Now isn’t it possible that the lightning also travelled along the copper wire to the green cabinet just outside the house and damaged something there which is corrupting the CLI signal, but which does not not show up when the voice line is tested? If not, then there must be a problem further back in the infrastructure, possibly in the Exchange, that is causing a corrupted signal to be sent to my phone?
He told me that another team would have to investigate the Caller Display fault as he was instructed to look into a voice issue and as a field engineer he was not able to investigate any problem that might be in the Exchange. I don’t know whether this Exchange Team would be able to investigate a problem in the Cabinet if nothing is found in the Exchange or can that only be done by a field engineer? He told me to contact BT again as he’d done all that he had been instructed to do and they would have to instigate a fault team to further investigate the problem.
When all this is considered we have the basic problem that BT are unable to provide me with a Privacy and Caller Display Service that I have been paying for, because of a fault in their infrastructure. How much longer is it going to take before they correct the problem that’s been going on since June 2014?

Display not working

Hi,
I am using Lenovo G510 Laptop. First I was getting an error of bad signature file which was stopping windows from loading.
I tried to fix it. I changed my BIOS Boot mode from UEFI to Legacy, and then system restarted. After the restart Display is totally black, like the Laptop is powered off. Hard disk light is on, battery power light also turns on when I turn on the laptop. But not showing any display. I've also tried by pulling out the battery and then pressing the power button for 30-60 seconds and then turning laptop on direct power. But it ain't working too.
Please any help in this matter will be highly appreciated.
Regards

Dear sir,
I gave my laptop to an HP authorized service centre in Ernakulum (Vertex techno solutions Bangalore Pvt ltd, Ernakulum) No: 2550, on 04/12/2014 . Same time i registered my laptop complaint in hp customer support. http://h30434.www3.hp.com/t5/Notebook-Hardware/display-not-working/td-p/4760312, informed me that no complaint to MB and GPU . But service centre informed that complaint in motherboard and asked me to change. When I talk them about the your mail and the details that you provided they suddenly respond they can't repair the laptop at their service center, disconnected the phone. I feel very much disappoint about your authorized customer services. In the mean time I kindly request you to take immediate actions regarding these kind of activities also provide a solution to repair my lap top
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Thunderbolt display not working on Macbook Pro - previously the display did work

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Hi,
Please help me on this..
In my flex application some functionality is working some times and not working sometimes..
In my project i have 5 sections with 5 separate screens..Each screen is of one diffeent module.
After logining into the application:
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Ex:: I have a screen with datagrid.From that user will select one job name from datagrid click on next button..
Based the job name the user selected i have to display some information in next screen and customer names.customer names is a combo box..
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This functionality is working fine when i visit to this screen first time..If you go back to another screen and come back to this same screen and click on next button this time customer names combo box has no customer details..I am getting Nullpointer Exception and it is showing the line number 5( i have given the number for code given above..)
If i change the first line of the code to below code:: every time the above functionality is working fine.Not getting any error msg..
var object_CustomerList:Object= event.result ;
If i type cast it to specific class(CustomerList) ,functionality is not working ..getting null pointer exception..If i type cast it to Object everything is working fine..In my code wherever i have typecasted it to specific class functionality is not working(gettingNullpointerExcepion).
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Thanks in advance..
Regards,
Satya

Hi Satya,
This sometimes as in your case might not work as the way you have specified the RemoteClass attribute in your AS class. As somtimes there may be a case as before it is mapped to a server side you are returned the data and so that you may not get the data as your Custom class but as normal Object type.
So in order to avoid this you can map the server side class to AS classes in the PreInitialize handler itself as shown below:
Specify the preinitializeHandler in your main application and write the below function.This way also you can map AS classes with the server side. So that you will not have any problem referring your application as AS class types.
You can use the same line for registering all the classes. By using this you can remove all the [RemoteClass] attributes on all AS classes and include it at single place.
preinitialize="onPreinitialize()"
private function onPreinitialize():void
registerClassAlias("com.expeditor.ScriptAdmin.Objects.CustomerList", CustomerList);
Here in the above line of code the string in quotes refer to the namespace of the Server side class and the latter is your AS class. Also dont forget to import the namespace of the corresponding AS class in the file.
Try this and let me know..
Thanks,
Bhasker

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Hey patvedo,
Thanks for the question. I understand that you are experiencing issues with USB on your Mac Pro. The following resource may provide a solution:
USB and FireWire Quick Assist
http://support.apple.com/kb/ht1151
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Laptop Built In Display and External Display not Working

Hi all, I have a HP Envy M6-1158ca, and recently my Built-in display stopped working. I plugged it into an external display via HDMI and it showed no input. It seems as though the laptop is not booting into Windows either, as usually whenever my laptop boots into windows, the fingerprint scanner blinks letting me know I can now sign in using it. I am extremly frustrated with this, and have an unbelieveable amount of stress because this was my only PC. Please respond as soon as possible, it would be much appreciated.
Thanks in advance.
This question was solved.
View Solution.

Yes.. i think thats what might have damaged it...Notebook should always be completely powered off with the battery out and ac adapter disconnected while replacing any internal hardware..
Shouldnt be a BIOS problem....but still you can check this link..
Restoring the BIOS
Note:
If you have HP Support Assistant installed on the computer(The Blue Question Mark) then open it ==> Complete all pending Updates & Tuneups==> Restart and Check. It may solve your problem
Although I am an HP employee, I am speaking for myself and not for HP.
**Click on “Kudos” Star if you think this reply helped** Or Mark it as "Solved" if issue got fixed.

External Display not working (descriptive details in post)

Hello
Background:
I have been using a black Macbook (last year's model - before the aluminum ones came out) and connecting it to a VIZIO VW22L HDTV10T (television/monitor) via a mini-DVI to VGA adapter.
This setup always worked, although it was a bit finicky (I'd have to plug it in before closing the display to get in to work in clamshell mode, for example). I get the feeling from reading other forum posts that this is the normal case, though (which so far has been my only real gripe with OS X).
Anyway, back a couple months ago I wondered if this finicky-ness was partially caused by a messed-up preference file, so I decided to try and fix this. In the ensuing tweaking, I somehow caused my Display preferences to disappear.
After much effort trying to fix the problem, I eventually called Apple support, which ultimately recommended that I reinstall OS X. I didn't do that, and continued to work at the problem. I eventually was able to bring it back by going into my Time Machine backups and restoring all the Display preference files (I used old preferences from back when I got the external HD, so I knew they'd be "uncorrupted). However, now I'm having problems with my external display, namely that it is not working.
This problem started early this year, so it might have been caused by the 10.5.5 update, but since I had all these other problems going on, I'm not sure if that was the case.
Problem:
The Macbook doesn't seem to recognize the display, or is having problems routing video to the display, or something.
If I plug the display into the Macbook while it is running normally, the Macbook LCD will flash blue (like it picked up a new display), but them come back to normal. The monitor will go out of sleep mode for a second, but then display a "No signal" message. If I attempt to "Detect Displays" the Macbook screen will either flash blue (as before) or just do nothing.
If I have the display plugged in when I start up the Macbook, everything will proceed as normal until the time the desktop would be displayed. Instead of this, I just see a blue screen (like some generic desktop before any background is applied). The menu bar, the dock, and icons do not show up. However, I can hear various audio cues telling me the computer is running fine except for htis problem (email notifier going off, etc.).
I know the problem is not faulty hardware, because when I boot my Macbook into Windows, everything works perfectly. It therefore follows that it is an OS X problem. I downloaded both Cocktail and Applejack and run various repairs on them (most notable repairing preferences), but nothing has changed.
Any suggestions about how to try fixing this? If there's any technical detail I've missed, let me know.
Thank you in advance to everyone who tries to help.
-Richard

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Hi
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Message Edited by SVOGT on 07-12-2008 05:37 AM

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Hello mrtessitor,
I'm sorry to hear you are having these issues with your iMac after a recent update to Yosemite; I know how frustrating that can be. If you are having issues with one of your external displays that was working previously, you may find the information and troubleshooting steps outlined in the following articles helpful:
OS X Yosemite: Connect multiple displays to your Mac
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Sincerely,
- Brenden

Sometime Display not working

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