23 inch hd display won't power up

After not using my G5 dual 2.7 for 3 weeks, i powered it up and the display remained black. the only hint that something was getting to the display was two quick blinks and a pause that repeated on the inrared on the mouse....keyboard was dead too. the screen turned on once after several restarts but remained blank after restarting again. i plugged into my powerbook with the same symptom. i have a 20 inch display that fired up fine on the tower so i ruled out the video card ( or so i speculate). what i discovered was by unplugging the power from the display to the power supply and plugging it back in , the screen came to life and stayed on until i shut down again. i duplicated this on the powerbook also. anyone hear of this? wouldn't think the power supply would have an affect but obviosly it does. I have a radeon 9650 in the computer.....any thoughts?

sorry i posted this question in the incorrect forum

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Imac display won't power up or stay on when it does

imac display won't power up or stay on when it does

Have you checked the Energy Saver settings? System Preferences / Energy Saver.
If the settings are what you want, you can try this. Change them to anything at all then change them back to what you want. The restart the computer and reset the PRAM.
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

IMac Second Display won't power down

I've added an LG 20" widescreen as a second display for my 20" Intel iMac (white). When the iMac sleeps or powers down, the LG display goes blank but not black, power button remains on and a "check signal cable" message displays.
A second problem is that I've been trying to get the two displays to look the same, color-wise. The color match option under displays>color gets it close, but that option has disappeared from the list of choices. Before, I could choose from the LG color settings as well as several generic choices (Color match, Adobe RGB, etc.) Those other choices have gone away. The calibrate option is still there. I just upgraded to Leopard. Did that have anything to do with it or was it just a coincidence?

Have you checked the Energy Saver settings? System Preferences / Energy Saver.
If the settings are what you want, you can try this. Change them to anything at all then change them back to what you want. The restart the computer and reset the PRAM.
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

Thunderbolt display won't power up at all

Hi I recently purchased a new 2.5ghz i5 mac mini and a thunderbolt display and when i plugged it all in the display wont power up all. Tried the hdmi connection on my hdtv and it worked fine. Tried a display port to hdmi adapter in the thunderbolt port to my hdtv and that worked fine. updated the mini to the latest software, checked all the cables, reset the pram still can't get it to power up. Am i missing something? There is no power button on the display that i can see, from what i understand it is supposed to come on when the mac powers up. For all the people that own a working thunderbolt display when going does it make any kind of noise or anything that you can tell that it is going, apart from a picture being on the screen. Because mine is seems to be dead doesnt make a sound, screen is blank. So far its a worthless piece of junk & i'm 3hrs away from the nearest apple store to get a replacement or get it fixed. Really starting to wonder about purchasing anything apple, just have one problem after another, first it was the apple wireless keyboard not pairing with lion os now this. Any help appreciated

I suppose the TB cable could have gone bad. If you get a another TB cable and plug it in from your MBP to the TB port of the display and see what happens. If it powers up and all ports work then it means the built in cable is bad. If nothing happens means the TBD is dead and will require repair.

Thunderbolt Display won't power up

So I have a Thunderbolt Display that I bought on eBay , trying to set up as my second monitor. The glass was broken, and I replaced it. Seemed great, I was using it last night daisy chained from my other TB display.
However, when I looked this morning, the second monitor would not power up. I tried connecting directly to my mbp, still no dice. I haves couple of USB dongles that typically light up when I plug them into the back of my other monitor, but they don't light up when I plug them into this one anymore.
I did mistakenly plug in a fw800 cable into the Ethernet port, but I don't imagine that I did any damage, since the FW cable housing is plastic, so I don't think it could have shorted out anyof the Ethernet pins.
Any ideas what could have happened overnight? Does this sound like a power thing maybe? Wiggling the TB connector doesn't seen to have any effect.
Thanks in advance for your help!
Geoff

I suppose the TB cable could have gone bad. If you get a another TB cable and plug it in from your MBP to the TB port of the display and see what happens. If it powers up and all ports work then it means the built in cable is bad. If nothing happens means the TBD is dead and will require repair.

Macbook (2.1Ghz white 2008 model) display won't turn on during start-up

hi all,
my problem is pretty simple.
Sometimes, after having used an external display with my Macbook (using the Apple Mini DVI > DVI adaptor: http://store.apple.com/au/product/M9321G/B?mco=MTY3ODQ5OTY ) the Macbook's own display won't power on during the next boot-up. I can hear the hard-disk start up, and the system boot, and I'm even able to navigate my way into the user login and shut the computer down (all via the keyboard). So the computer is definitely powering up (and in a seemingly normal way), but the display isn't.
For example, last night I was using an external display with my Macbook. This morning I plug the display back into my Mac Pro, then power-up my Macbook. But the Macbook's display won't turn on. It's as though it thinks the external display is still plugged-in. I know, that if I re-connect the external display, the Macbook's login page is displayed, but only on the external screen.
The problem only arose after I started using this particular external display (a cheap 22" BenQ, model G2222HDL 'senseye 3'). I wouldn't normally use the display with my Macbook, but my Mac Pro has a **really** noisy optical drive (CD/DVD), which makes watching films pretty unbearable (if you're into sound anyway, which I am).... so until I get my Mac Pro's drive sorted (when I have a few spare days when I won't be needing it), I'll have to continue using my external display with my Macbook to watch films.
My Macbook's specs are as follows:
2.1Ghz Intel Core 2 Duo Macbook (2008 model - I think, maybe 2009?)
4Gb RAM
Running OS X 10.5.8
Are there any known display issues with these models of Macbook? Or are there any software/firmware updates that address any display issues?
In general, I don't update the software/firmware unless I need to, or unless something doesn't seem to be working properly.
However, I've just checked Software Update, and noticed there is an SMC firmware update (1.4). So I might give that a go and see if the problem persists.
However, the problem is intermittant, and kind of unpredicatable, so I might not know for a while if it solves the problem or not.
Has anyone else had a similar problems?
Alternatively, is there a possibility there is some kind of virus or file-corruption causing this problem?
My girlfriend has a similar model of Macbook (which she's never had any problems with). Recently I moved a whole bunch of files from my Macbook to hers, and she noticed that hers had a similar issue starting up, where the display failed to turn on.... so it seems like
a) it might be a common-ish problem in this model of Macbook
or
b) perhaps I've got some kind of virus on mine?
I've been using Macs for about 15 years (yet, I don't consider myself a computer expert, when it comes to the technical details). In those 15 years, viruses have never really been a concern to me, as I've never really thought they were much threat to Macs. However, I guess, as Macs get increasingly more popular, there's a possibility people will write more Mac-specific viruses...?
Anyway, I'm open to suggestions : )
Regards,
Sam
PS I've tried:
-re-starting the computer multiple times (which sometimes works, but usually doesn't).
-re-setting the SMC (which usually works, but not always)
-plugging/un-plugging the external display to try and jog the computer into noticing it isn't connected (which doesn't work)

let me ellaborate on this part:
"b) perhaps I've got some kind of virus on mine?"
I mean, " perhaps I've got some kind of virus on mine, and I've passed it on to hers?"

Help I need a "power brick" for my 30-inch cinema display!!!!!

I recently moved and lost my "power suppy brick" for my 30-inch cinema display..How do I get another one?? The Applestore wanted my old one to do a even exchange?? But I can't do that...And they don't sell the product as a replacement. I'm stuck with a 2 month old display I can't even use! Any ideas???
Sony Vaio Windows XP

If the display is covered by AppleCare call 1(800)275-2273 and ask for a replacement power adapter. They will send the new unit first, and you are supposed to return the bad unit. You give them a credit card number when you order the part, so they can charge you, if for some reason they don't receive the old part.

32 inch Cinema Display turns off repeatedly?

32 inch Cinema Display has taken to turning itself off afer 30 minutes operation.
Can this fault be repaired or should I be looking at buying a new display?

I have a 20" Cinema Display connected to an early 2008 MacPro. After years of service the monitor suddenly started going black, quite randomly. It would even happen part way through playing an edit from FCP. Strangely audio would be maintained though picture was lost. If I switched monitor power off and on again I would usually restore video image. Sometimes I had to do this power cycling repeatedly.
Looking through other posts it seemed a failure of the internal power unit was the most likely cause of the problem. But replacement seemed risky and not guaranteed. I considered buying a new monitor (probably a Dell UltraSharp since the Apple monitors are now so expensive).
Then I tried something else. In System Preferences and then Energy Saver I set the Computer Sleep slider to 25 minutes (I had always previously kept it on 15 minutes). Bingo! Problem solved.
Maybe this won't work for everyone but it certainly saved me some cash outlay. For now.

Display won't wake up

It's a brand new notebook.I've done nothing on it, other than installing Windows updates and creating recovery disks.I set the "Turn off display after" option to 1Minute.IMPORTANT: I set display brightness all the way to zero, the lowest setting possible, using either the keyboard keys, or the brightness option in Windows.Leave the notebook idle for a minute, the display sleeps like it should (the notebook is set to sleep after 30 minutes, it's only the display that sleeps, the notebook is still awake).Move the mouse, press keys on the keyboard, the screen does not come back up. The computer is still up and running-i can toggle keyboard backlight On/Off using the keys, but the display won't wake up.Press the "Brightness +" button on the keyboard, the display wakes up. This is the only way to wake it up. The other option is to press and hold the power button, force a shut down, and start the computer again.This happens ONLY when "brightess" is set to the lowest level. If brightness is set to even one level above the lowest, the issue cannot be reproduced. Moving the mouse or pressing any key on the keyboard will wake the display up in this situation.Both Intel HD graphics 5500 and GTX 850M drivers are up to date.BIOS is up to date as well.Battery/ Plugged in does not make a difference. If the display brightness is set to lowest, the screen will ALWAYS fail to wake up, irrespective of which power source is in use. What do I do? Please don't tell me it's a minor problem and I have to live with it.There are so many minor problems with this notebook, and all these are adding up to make it a total piece of cr.. My almost 5 years old probook with a second generation core i3 CPU and no discrete GPU, is better than this brand new 5th generation core i7+GeForce GTX notebook. I'm beginning to regret this purchase. I should have gotten another probook. Thought the Envy offers a better "bang for the buck", and now i think this was a huge mistake. Anyway, any idea how i can get this fixed? Looks like a driver problem right? Or is this a hardware problem? Can someone with an Envy notebook try this out and tell me if the issue can be reproduced on their rig? It can't be reproduced on my Probook.Thanks.

Thanks for your reply Avenger Well, I called up HP tech support.The lady took remote control of my notebook and tried numerous things in the registry (regedit).But the issue could not be solved. She then arranged for an on-site support engineer to visit my house.The Engineer showed up right on the next day, and tried the following:- Updated ALL drivers, even the ones which were already up to date!Checked with my desktop monitor, the issue cannot be reproduced on the external monitor- the external monitor will wake up on moving the mouse, but the notebook monitor stayed dim (no backlight).Opened the laptop, took out the display cable, cleaned it with some solution he had, put everything back together- issue not resolved, external monitor wakes up but notebook monitor stayes dimmed. This is not the only problem I was having with the notebook, the other problems are:Battery would stop charging when the notebook is switched OFF, and the charger is turned ON and OFF a couple of times.The battery lock doesn't "click" in place, it slides automatically to the "unlock" position, it's loose.There's a dead pixel on the display. He offered me two choices: 1> Replace motherboard (to solve battery not charging issue), replace chassis (to solve the battery lock issue), and replace display panel (to solve the dim display + dead pixel issue). =======OR======= 2> Return the whole notebook back to HP, and get a new notebook (same model) in exchange. I picked option 2. We shared a cup of coffee, and the tech left (he was very nice and friendly). The next day, I got an email from HP, with a PDF attachment, asking me to take my laptop, along with a hard copy of the email, and payment invoice, to the HP store. HP store took my computer back, but they didn't have a replacement ready, they asked me to come after 7 days to pick up a new notebook (same model). I really loved my Envy. It's a very nice looking laptop. Hope the replacement I get won't have these weird issues. I'll update the thread when I get the replacement. Thanks for your help

MBP display won't stay off, wakes from sleep

I have a newish 15" MBP, 1680 display, hooked up to a Dell external monitor when it's at home. When I go to bed I cut power to the display via control-shift-eject, but generally don't put the computer to sleep overnight.
With this new machine, after it's been running for a while (as little as a day, or as long as a couple weeks), the displays will come on again in the night. Once this happens, the displays won't stay off for longer than about five seconds. If I then put the machine to sleep, it'll wake itself up minutes or hours later (generally not long enough to miss a Time Machine interval). The only cure is rebooting.
I tried an SMC reset, but that fix only lasted about as long as any other reboot.
I've since tried systematically removing every peripheral (a USB hub, the external display, any directly-connected iOS devices) and testing display-off after each; no change. I've turned off my Bluetooth keyboard and mouse, then disabled Bluetooth on the computer, turned off wifi, quit every menu extra (jitouch, Viscosity, Dropbox, Pastebot, Fastscripts, Transmit, Teleport), and quit every running application. The problem remains repeatable after every step.
It's repeatable at the moment — any suggestions for other things to try, preferably short of the reboot which temporarily masks the problem? I'm a little concerned that it's going to manifest at some point while I have the laptop sitting in a bag, which will then cook itself.
I'm on 10.6.4 now, the problem started on 10.6.3.
Thanks.

Try checking the system logs in Applications/Utilities/Console.app for clues. The entries carry time stamps. Usually a wake event will leave some trace. By matching time stamps to the time of occurrence you may find the culprit.

Help! PowerBook Won't Power On and Start Up!!!

Hi All,
I’m hoping someone out there can help! My PowerBook G4 15 Inch (Original model) won’t start at all. When I push the power button, nothing happens. Nothing at all. No lights, no sounds, no fan, nothing. It was working fine when I put it away on a shelf in my closet about a year ago, but when I took it out to look up a document, I found that I couldn’t turn it on. It hasn’t been dropped, knocked, exposed to water, etc. It’s literally just been sitting on a shelf for about a year. Some information which may help:
1. It appears that the battery does not hold a charge anymore, because I left the laptop plugged in overnight and the indicator lights on the battery still do not light at all when the power status button on the battery is pressed. However, I don’t think this should affect startup when the AC adapter is plugged in – the PowerBook should start up regardless of the power status of the battery. (By the way, I know that the AC adapter is good because I tried it on a friend’s PowerBook and it works fine.)
2. I’ve already reset the PMU (several times) by pushing the little button on the rear of the PowerBook with the end of a paper clip. That doesn’t change anything either.
3. I’ve removed the battery and left the laptop plugged in for approximately 15 hours just in case the internal PRAM battery needed a charge after having been stored for so long. No luck there, either.
I can’t understand what could have happened to it just sitting on a shelf! I had another Mac laptop sitting right next to it for the same amount of time, and that one started up just fine. Does anyone have any ideas as to what the problem could be and a potential solution(s)?
Many many thanks in advance to anyone who can help!

Appler5 wrote:
it seems fairly cheap and easy to fix
Yes, which is why I'd tackle that first. My first suggestion would have been to try the power adapter with a meter or on another Mac or check, but you're a step ahead of me on that, so aside from a possible, but highly improbable death while resting on the shelf, the b.u./PRAM batt is the obvious issue.
I do hope that's what this turns out to be
Me too. It'd be worth it for your time and money, whereas other, major, components would likely not be cost effective, given the PB's age.
I'll update with a post when I know more.
Please do, and good luck!

Display won't sleep after being in suspend once.

When rebooting the computer, the display sleeps after set interval and can manually be put to sleep using shift+ctrl+eject.
However if the computer goes to sleep or I myself close the lid to make it sleep, the display won't sleep again.
The display won't sleep after set interval in power settings and when I press shift+ctrl+eject the keyboard backlit turns off but the screen stays on.
The only way to make it sleep is to close the lid.
I have tried resetting SMC and NVRAM but to no avail.
I have the first generation aluminium macbook.
Does anyone else have this problem?
I have had this problem both in 10.6 and 10.8
Regards Robin Hansson

When rebooting the computer, the display sleeps after set interval and can manually be put to sleep using shift+ctrl+eject.
However if the computer goes to sleep or I myself close the lid to make it sleep, the display won't sleep again.
The display won't sleep after set interval in power settings and when I press shift+ctrl+eject the keyboard backlit turns off but the screen stays on.
The only way to make it sleep is to close the lid.
I have tried resetting SMC and NVRAM but to no avail.
I have the first generation aluminium macbook.
Does anyone else have this problem?
I have had this problem both in 10.6 and 10.8
Regards Robin Hansson

Add old 18-inch Studio Display to 2013 iMac; How ??

I need more screen real estate. My current computer is a 27-inch iMac, bought in May, 2013. When I bought the iMac the folks at the Apple store across town told me I needed an adapter to run a 2nd monitor and they sold me a “Mini DisplayPort to DVI Adapter”. The DVI end of this has a 24-pin female connector with one horizontal bar.
My new machine replaced a dual G4 Mac tower, from 2002, that used an 18-inch Studio Display monitor. Problem is, this monitor has a 30-pin male connector with one horizontal bar that simply won't fit my adapter.
The guy at my near-by Microcenter store told me that they have no adapters to handle the transition between my old Studio Display and my new computer. But he said he thought Apple had something for $190 that would handle the transition. Hmmmmm. I can get a new monitor for less than that!
I've spent a couple hours rummaging around in the FAQs and don't find anything that helps me.
Anybody have any suggestions about how to attach my old Studio Display to my newish iMac?
RICHARD

Is it one of these:

My 30-inch cinema display often doesn't come on at startup and I have to disconnect it and reconnect to work.

I have a 30-inch cinema display connected to a Mac Mini. When I first boot up the computer after having it shut down for a couple of days, the display screen does not illuminate about half the time. If I disconnect the display from the power brick and then reconnect it usually comes on, although sometimes I have to do that more than once. It works fine once it on and displaying. Anyone else seeing this?
Rocketman

Hi Rocky Rakoon,
Thank you for your post, and welcome to the Apple Support Communities.
I understand that your Apple Cinema Display is not turning on upon startup. I'd like to reset the following, as it may resolve your issue:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
You may also want to reset your computer's PRAM:
OS X Mountain Lion: Reset your computer’s PRAM
http://support.apple.com/kb/PH11243
Note: Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.
For more troubleshooting directly related to the Cinema Display, see this resource:
Apple Cinema Display: Troubleshooting steps
http://support.apple.com/kb/HT2810
Thanks,
Matt M.

L7680 won't power on - no printheads or cartridges

My nonprofit was given an Officejet Pro L7680. The printheads & ink cartridges are missing. The machine won't power on and we've run through the items listed under HP support. The AC power pack is lit up & so is the light on the back of the machine where it plugs in. On the front of the machine, neither the power "on" button nor the display light up.
We've not yet connected it to a computer and we can't afford to purchase $200 worth of disposables for a machine that might be dead.
Do these parts need to be installed for it to power up? Should we just toss it or have it repaired? Any advice would be appreciated!

The small battery is a PRAM battery. It could be the cause of the non stsrt.
Troubleshooting portables that won't turn on or start up
http://support.apple.com/kb/TA25686?viewlocale=en_US
Troubleshooting: My computer won't turn on
http://support.apple.com/kb/TS1367
 Cheers, Tom

23 inch hd display won't power up

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