Flickers while starting up, and goes black

PB G4, 15-in screen. On start up, the screen begins to flicker, and goes completely black by the time the machine is fully running.
I've hooked an external display up to the PB, and it works just fine, so I'm thinking the graphics card is good. Bad LCD? Inverter? Opinions!

After boot, shine a strong light on the dark screen, and see if you see the desktop faintly, or shine the light thru the Apple logo on the lid. If you see the faint desktop, then it should be the backlight that's bad. What is harder to determine is if it's the inverter or the lamps.

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HP 2509b Monitor starts out and goes black.

OP Windows 7 64-bit
My HP 2509b monitor flickered on and off ... I restarted my machine ... the monitor came on, then slowly went black. It does this on my husbands computer also. The spare monitor I have hooked up works great ... but it's not my HP 2509b. I have owned it a little under a year.

bperigo,
This is a very well documented issue of this monitor. Searching the forum yields at least 80 threads containing "2509m".
Please shine a flashlight at the front on the screen at various angles and look a faint image on the screen. If you see an image that corresponds to the output of your computer, your backlight inverter and/or lamps have gone bad.
Concerning the menu options, again shine a flash light at the screen and look for the menu image. If the backlight inverter and/or backlight lamps have gone bad, you will see no image without an external light source because the monitor isn't producing it's own light as it should.
Frank
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HT3964 my iMac won't boot up. I hear the chime and the Apple symbol appears but there is no whirling indicator that appears and after a while the computer screen goes black and the whole cycle starts again. There have been occasions when it has actually s

my iMac won't boot up. I hear the chime and the Apple symbol appears but there is no whirling indicator that appears and after a while the computer screen goes black and the whole cycle starts again. There have been occasions when it has actually started and I have the dashboard appear but then the screen freezes

Since you have Lion v10.7.4 installed, use Lion Recovery to repair the startup disk if necessary, or reinstall the Mac OS X.

Phone vibrates 5 times and goes black, only fully boots while plugged into USB at splash screen

I have an HTC Droid Incredible with stock firmware 2.2 and it will no longer boot properly. The phone is not rooted or altered in any way.
When the power button is pressed, the phone shows the HTC Incredible splash screen, vibrates 5 times, and the screen goes black and the LED light flashes green over and over until the battery is pulled out.
Strangely enough, if the phone is plugged into a PC via USB or a charger during that splash screen for a few seconds (at least 5), it DOES boot up to the OS and seemingly works fine, but the SD card and internal storage is listed as "unavailable". I can also access the HBOOT menu by holding volume- while turning the phone on.
The phone then functions until the next time it needs to be rebooted, or if you attempt to plug it in via USB again (only when attached to a PC) and remove it, then it vibrates 5 times and goes black once again. If you repeat the battery pull and USB plug-in process it works again.
I've been able to successfully return it to the factory setting, reflash the stock ROM via SD from the HBOOT menu and from a RUU from my PC, but it doesn't fix the issue. The SD card has been reformatted properly and error checked and can be accessed from a card reader... just not while it is in the phone.
Pretty weird issue that's driving me crazy.

This reply in that link is what I am suggesting should have been implemented in the Droid 4:
“Just adding my 2 cents. Found this to be odd with my new phone. Previous WM6.1 phone I would sync and charge overnight with my PC and let both 'sleep' when done. WM6 must be closing the port when the USB power drops so not to deplete the battery.
Just one more quirk with the new device.”
There is no reason for current leakage into a sleeping computer because of keeping data lines open. It should be easy enough to shut down the usb port when a voltage drop is detected in on the power pins. In any case, hopefully my posting will at least alleviate some anxiety for someone down the line. The procedure gets the phone back up and running in an expedient manner. Thanks for your research.

Screen flickers and goes black on boot up.

Have an older white MacBook that when I boot up, screen flickers and goes black, MacBook does power on.
Any suggestions?

I am seing a similar issue with a 13" White MacBook.
Powers on ... chimes ... then screen goes blank as if the machine has gone to sleep. Hitting the Return key or the power button wakes it again, but only for two seconds ... and repeat!
Any help gratefully received!
Chris

T40P Black screen or fuzzy colors and goes black

I recently have this probpem. My laptop will go black but still running or fuzzy and starts to fade and goes black but if I lift it up and tap it down softly on the desk the screen comes back up(sometimes). I read somewhere it could be a loose cable which makes sense if I move or tap it and it comes back on. Anyways this is happening more often. I am wondering if I get a monitor to use for the short term will it solve the issue. I have work to get done in the next month. I did have to reload all my software in April and thought it could be a driver but agian tapping it makes me think that is not it. I called an IBM repair shop and they could not fix it within a week and I need it so I am hoping a monitor is a short term fix. Any solutions? I can buy a new laptop but would like to fix this one and have as a backup if possible. I am not tech savy-I do accounting and need the info on the laptop to finish some jjobs. Also-can I just take out my drive and put in another laptop? 2373-G3U thanks

Hello mkandziora,
the incident that your display goes off by moving your unit, seems to point to a problem called flexing.
The mobo flexes and the gfx chip, soldered on mobo, became loose and you´ll need a new mobo.
In euro´s 150,-.
It´s a more common problem of T4* series.
Kind regards
Andreas
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I am having problems with my computor freezing and going black screen and then coming on again,

i have a windows 7 hp elite and am having problems with it freezing and going black, was doing it on the zynga games, not it is with everything. i have cleaned, defraged, and shredded files, etc and have all the updates and even had it restored, but nothing is working. any ideas?

remove power cord, take battery out, hold the start button for 4 min, put battery back and press start lightly and hit f8 immediately severals times. it may start up right away or take several times.

I have an iMac. , mid 2007. Frequently, when I take an action, the little color wheel starts spinning and goes on for quite awhile. Save a file, close a file, open a file, open a window, it's all random. Somtimes it stalls, sometimes it doesn't. Why?

I have an iMac. , mid 2007. Frequently, when I take an action, the little color wheel starts spinning and goes on for quite awhile. Save a file, close a file, open a file, open a window, it's all random. Somtimes it stalls, sometimes it doesn't. Sometimes long, sometims short. Why is this happening?

Consider adding more memory. Be sure you have adequate free space on the hard drive - 15 GBs or 10% of the drive's capacity, whichever is greater. Do not run too many applications concurrently. Visit The XLab FAQs and read the FAQ on resolving the SBBOD.
Do some maintenance:
Repair the Hard Drive and Permissions
Boot from your Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
Kappy's Personal Suggestions for OS X Maintenance
For disk repairs use Disk Utility. For situations DU cannot handle the best third-party utilities are: Disk Warrior; DW only fixes problems with the disk directory, but most disk problems are caused by directory corruption; Disk Warrior 4.x is now Intel Mac compatible. Drive Genius provides additional tools not found in Disk Warrior. Versions 1.5.1 and later are Intel Mac compatible.
OS X performs certain maintenance functions that are scheduled to occur on a daily, weekly, or monthly period. The maintenance scripts run in the early AM only if the computer is turned on 24/7 (no sleep.) If this isn't the case, then an excellent solution is to download and install a shareware utility such as Macaroni, JAW PseudoAnacron, or Anacron that will automate the maintenance activity regardless of whether the computer is turned off or asleep. Dependence upon third-party utilities to run the periodic maintenance scripts was significantly reduced since Tiger. These utilities have limited or no functionality with Snow Leopard or Lion and should not be installed.
OS X automatically defragments files less than 20 MBs in size, so unless you have a disk full of very large files there's little need for defragmenting the hard drive. As for virus protection there are few if any such animals affecting OS X. You can protect the computer easily using the freeware Open Source virus protection software ClamXAV. Personally I would avoid most commercial anti-virus software because of their potential for causing problems. For more about malware see Macintosh Virus Guide.
I would also recommend downloading a utility such as TinkerTool System, OnyX 2.4.3, or Cocktail 5.1.1 that you can use for periodic maintenance such as removing old log files and archives, clearing caches, etc.
For emergency repairs install the freeware utility Applejack. If you cannot start up in OS X, you may be able to start in single-user mode from which you can run Applejack to do a whole set of repair and maintenance routines from the command line. Note that AppleJack 1.5 is required for Leopard. AppleJack 1.6 is compatible with Snow Leopard. There is no confirmation that this version also works with Lion.
When you install any new system software or updates be sure to repair the hard drive and permissions beforehand. I also recommend booting into safe mode before doing system software updates.
Get an external Firewire drive at least equal in size to the internal hard drive and make (and maintain) a bootable clone/backup. You can make a bootable clone using the Restore option of Disk Utility. You can also make and maintain clones with good backup software. My personal recommendations are (order is not significant):
Carbon Copy Cloner
Data Backup
Deja Vu
SuperDuper!
SyncTwoFolders
Synk Pro
Synk Standard
Tri-Backup
Visit The XLab FAQs and read the FAQs on maintenance, optimization, virus protection, and backup and restore.
Additional suggestions will be found in Mac Maintenance Quick Assist.
Referenced software can be found at CNet Downloads or MacUpdate.
Be sure you have an adequate amount of RAM installed for the number of applications you run concurrently. Be sure you leave a minimum of 10% of the hard drive's capacity as free space.

When i press the on/off my ipod show me the lock screen only half second and goes black.

When i press the on/off my ipod show me the lock screen only half second and goes black.
I try again and works normally. Sometimes do that.
What Happens?

Try the standard fixes:
- Reset. Nothing will belost.
Reset iPod touch: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Restore from backup
- Restore to factory defaults/new iPod.

IPad screen locks itself and goes black when nudged? very frustrating

Hi, my IPad is driving me nuts! Can anyone help please?
I can be in the middle of anything ( games, apps, typing, banking, etc. etc.) and with the slightest movement or nudge - the screen locks itself and goes black??
I then have to press the home button, slide to unlock it - and it opens back up to exactly where I was.
This happens constantly, and is so frustrating!

Is there a case or screen protector that is possibly interfering with the proximity sensor (detects if the phone is near your face, allows the keypad/screen to be visible when the phone is away from your face)

When using FaceTime the picture is delayed and goes black ever since I updated to iOS6.0.1???

Since I updated to iOS 6.0.1 when using FaceTime the picture is delayed and goes black???

The <b>authorize<i></i>.net</b> website is using autocomplete=off to prevent Firefox from saving and filling the name and password.
You can remove autocomplete=off with a bookmarklet to make Firefox save the name and password.
*http://kb.mozillazine.org/User_name_and_password_not_remembered
*https://support.mozilla.org/kb/Username+and+password+not+remembered

Why is my 2007 HP V17 monitor screen flickering and going black?

I have an old 2007 HP V17 monitor attached with a VGA cable to an early 2008 Macbook running on OS 10.6.8 software via a DVI- mini connector (this is also my desktop computer).
About 6 months ago, the HP display started going white and sometimes gray for a few seconds before the image would return, and a couple of times I had to unplug it and restart the Macbook before it came back. I followed Apple's instructions for testing whether the problem was in the computer (= resetting the system by resetting the Mac's parameter RAM and SMC), but the computer tested okay. I then purchased a new VGA cable and DVI-mini connector, but the problem persisted.
Today the HP screen suddenly went black (first time going black) and stayed black. The power button stayed lit and if I pressed the Volume or Auto buttons, the "Volume" etc. message boxes did appear, so the device's backlight is apparently working and not burnt out (unless the backlight has nothing to do with the message boxes showing up, which for all I know may be the case). However, the Desktop showed up only on the Macbook.
I checked all the connections, removed the DVI connector and plugged it back into the Macbook several times, but the HP screen stayed black, so I removed the DVI connector in order to type this message on the Macbook. Then, as I was writing this, I decided to plug it back into the Macbook one more time--and sure enough, the display is back!
I love this monitor, which is the perfect size and ergonomic height for my setup, so I'd hate to have to replace it. Can anyone tell me
Given the information above, what's the probable reason for the flickering and going to black? If it's the computer, what could it be? Can I solve this problem myself? (See above; I couldn't find any other ways to test the computer in the Apple articles database.)
If not, could a monitor this old be repaired?
If so, how much would repairing it cost, since buying a new monitor that I probably wouldn't like as much would cost upwards of $300?
Thanks so much for any advice out there!

Hello @turtlewiz,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that your HP V17 Monitor has gone black and is not displaying anything. I am providing you with some steps for you to try below:
Step 1. Unplug the power cord from the back of the monitor and the wall
Step 2. Hold the power button down for at least one minute
Step 3. Plug the power cord back into the monitor and then into the wall outlet (not a power bar or surge protector)
Step 4. Press the Menu button on the monitor
Step 5. Navigate to the Factory Reset option and select it
If the issue persists after this you can try the monitor on another computer to see if it continues. If it does it appears to be a physical issue and I think it would be best if you contact HP Technical Support for repair options.
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
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Computer won't start up after recent version of mountain lion. My power Mac was running extmely slow this morning, so i shut down to restart. As it is starting the screen goes black, says something about debugging with the word panic in parentheses. was

I upgraded to latest version of mountain lion yesterday, this morning my power Mac was running extremely slowly (while typing, had to wait a second or two for words to appear), I shut down to see if problem would clear up. When starting up, screen went black with programming jargon, something about debugging with the word panic in parentheses. Screen then goes back to gray, says Mac encountered a problem and has to restart once I push a key. Apple logo comes on gray screen, icon keeps circling and nothing happens. This has happened three times in a row after shutting down and trying to restart. Any thoughts?

When verifying disk, said could not repair disk, back up as many files as possible then re format disk. Computer now doing Internet recovery. Should I. Do the following in this order
1 restore from back up on time machine
2 re install osx
These are the options coming up on osx utilities window

After restore, Pavilion a6250t appears to start then screen goes black.

Have tried F11 restore as well as restore from DVD. In bothe cases, The system restarts after retsoring the Windows partition, attempts to start Vista then screen goes black, while the CPU appears to be processing the restore. Suggestions?

XFX Radeon HD 5770 = PC only card, compatibility is not a guarantee
You realize there is EFI type firmware that makes a Mac a Mac? and PC even with "UEFI" don't require or use graphic cards, hence Apple vs PC
you know by going to Apple Store or a vendor like OWC or that says "Mac Pro" Compatible - you can find Apple hardware on Amazon for instance.
Or you buy from a vendor like MacVidCards that deals with GeForce cards (mostly if not exclusively) FOR Mac Pro.
And there are different options for 2008 vs older which is why it is important when you have lack of clarity and have one thread being thread-hijacked in two.
http://netkas.org
Has forum and more about 3rd party non-Apple AMD/Nvidia and support down the road or using off the shelf PC cards.

Internal display normal during start up but goes black with external monitor showing desktop

My MacBook Pro (2.4 Ghz, Santa Rosa with infamous nVidia card) acts strange. It shows the normal gray screen with Apple logo and animation flawlessly during start up but the internal display goes black without any rendering at all when all is loaded. (shining a light on display show nothing) If an external monitor is connected through the DVI port it will remain black during start up and then show the desktop as the internal display goes black. This happens both while booting to Mountain Lion and Windows XP. I have checked "About my Mac" and only the external display is listed. The same is the case if I use the nVidia Control panel in Windows XP.
My questions: Is this a hardware problem or is it related to software maybe even firmware? What controls the display during start up, graphics card or something else?

I found an article about the same issue. Screen looks exactly the same with bloated apple logo.

Flickers while starting up, and goes black

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