"instant boot" to gray scale, then full use
28Apr2015
iMac: 21.5, late 2013, OSX 10.9.5
I occasionally disconnect my iMac and store it or disconnect it when lightning is threatening (we live in Florida). Lately, the last couple of months, when setting up the mac again out of storage or disuse, I hit the power-on button and the screen immediately displays in gray scale everything: the wallpaper, all the folder/file icons, and a progress bar below. In less than 30seconds, the color snaps back, and all files, and programs that were launched before I shut down are now “instantly” available. Please explain what is going on.
Thanks.
Sounds like your iMac is entering Standby About standby on your Mac - Apple Support
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I've had leopard installed on my MBP since Oct 27th and it's been running great, although I've noticed several times when I shut down, the machine really hadn't - I'd stick it in my briefcase only to find that the mac was on and the battery was down 50% an hour later. Searching the boards, I'm gonna assume that I have the same problem as those reporting the "screen goes black after a few minutes" problem. That's all weird enough, but last night it shifted into high gear.
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Then I turned it on, it chimes, comes to the gray screen, spinning gear goes for a bit (normal amount of time) then the blue screen flashes for the tiniest fraction of a second and the screen goes black. I waited for a bit and after a little while I noticed the faintest outline of dialog on the screen - I could not read it, but it looked to have four buttons. I pressed the Enter key, the dialog disappeared and the HD spun about for a bit, but the screen never came back. I forced it off again.
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/perk
(Please note that my profile machine is my desktop, not my MPB)No worries mate. Creeped me out pretty big, but when my Leopard DVD did the same thing upon bootup I knew the problem was weirder than what I had thought.
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Intel iMac will not boot past gray screen
my system:
new (month old) 24" intel imac, 2.8 ghz, 4 gb ram.
running: leopard (upgraded from tiger, which was pre-installed at purchase), installed 10.5.1 update right before this huge problem occurred.
install discs on-hand: two-disc tiget set, single leopard upgrade disc.
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at this point i was running leopard 10.5
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Casey Burns Illustration and Design
http://CaseyBurns.comI'd call Apple support at this point. You'll need
to put this issue on the record.
Call U.S. iPod and Mac technical support: 1-800-APL-CARE (1-800-275-2273)
The wait may be long for an agent to come on the line
so expect that and have some other stuff to do in the meantime.
If you have the applecare protection plan, I'd ask about "onsite"
service.
I like your work ! Good luck !
Slim
Message was edited by: slimpikkunz -
IMac Does not boot past Gray Screen
iMac does not boot past Gray Screen. 2008 24" Intel iMac running Mountain Lion with 1TB hard drive.
Problem started yesterday while I was web surfing, and my iMac frooze and shutdown. I rebooted and could only get as far as the gray screen.
On bootup the following things happen:
Startup tone
Gray screen with Apple, and gear spins below Apple.
Once the gear stops spinning, nothing happends.
Troubleshooting steps I have tried:
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booted into Safe mode and run disk utilites.
Disk Utilities found no errors on the drive, but did find two permission issues that it was able to fix.
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Second permission issue:
"Permissons differ on library; Should be drwxr-xr-x; They are drwxrwxr-t"
Disk Utilities says it fixes these issues and then I reboot, but get the same problem.
I reboot back into Safe Mode and run Disk Utilities and it discovers the same problems listed above with Permissions. It says it fixes them, I reboot, but the same problem occurs. Its as if we are stuck in some sort of loop process.
Booted into Single User Mode and ran the following command:
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I reboot, same issue !
Performed SMC Reset, Rebooted, same issue
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While in safe mode, I preformed a full time machine backup.
I am out of ideas. Any help would be greatly appreciated.Hello,
I reboot back into Safe Mode and run Disk Utilities and it discovers the same problems listed above with Permissions.
You can ignore repeated "fixes" it's not really a problem, if it says completed repairs that's all that's needed.
Luckily it boots in Safe Mode, here's basically the steps to try to find out what it is...
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
/Library/LaunchDaemons
Though I'm suspecting some corruption to your OS at the moment. -
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I made a blank document , 11x14".
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RichPaulo,
Thanks. I was ready to believe the monitor idea but I still have some reservations.
I don't doubt what you said about the pixels (sounds correct to me).
Why?
I tried another monitor and the images I attached also look like the top one is darker (vertically).
Also, the same is true if I scrolled the images. It seems to me that I should see a difference as I slowly scroll the image vertically. I didn't see a difference.
Read on please.
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company. I would think I would have read some bad reports about these
LCDs?
Also, wouldn't the color images also be different when presented the same way? (they aren't).
However, I went back to the original T220 LCD display and moved an image in to a blank one as before, then did the control J to copy the layer, and the images we different again. But, I zoomed in more than usual and scrolled the images and they were lighter at the bottom of the screen and darker at the top of the screen!!!!!!
That is good news and bad news! $$$$$$
If it is the monitor problem, then both images should print as the same.????
Secondly, the display (LCD) attached to the machine at Sams showed the same difference between the two images. AND, I recall that the display is also a Samsung (I will check that tomorrow).
What a bunch of coincidences! I guess I have to search the web for some Samsung answers? and contact the company?
I want to explore as much on my end as possible.
Hunt and another suggested the Control-J to avoid the problem by copying the layer. That didn't work either.
I suppose I could tweak one of the images after bringing them in but I don't know how (I clicked the layer and I wasn't able to do anything - like lighten that image).
Again, thanks for the help. I think the question maybe answered.
I will send the screen capture shortly.
Rich -
How to convert color image(24 bit) YUV 4:2:2 to gray scale 8 bit image
I am using sony DFW-X700 color camera for one of vision applications.Does NI Compact Vision System(CVS) support YUV 4:2:2 format(8 bit each).I want to do gray scale processing, so i need to convert the YUV color into gray scale (8-bit) in the software(like Labview). Please suggest us how to do this conversion for better gray scale image clarity from color.
In YUV color space, Y represents the gray scale; in RGB color space, R=G=B represents gray scale. You can simply set R=G=B=Y, to convert YUV to RGB. If the original color depth is 24 bit, then the result is 24 bit too.
You can create gray scale color table like this:
array size = 256;
[0] = 0x000000;
[1] = 0x010101;
[2] = 0x020202;
[255] = 0xFFFFFF;
To convert 24 bit gray scale to 8 bit, check every pixel in 24 bit image to find the array index according to the color table, and replace the pixel with array index.
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George Zou
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Julie -
Store a 12-bit gray scale image
I'm using a video camera to acquire images. This camera delivers 12-bit gray scale images so 4096 levels of grey. However, when I store these images on my HD on PNG format, the maximum value of a pixel is 256. Which is normal because the 3 colors R, V, B are coded onto 8 bits each. How is it possible to keep the signal dynamic of the image delivered by the camera? Does it exist an image format which would allow me to store the pixel values onto 12 bits ?
I'm using the IMAQ function "IMAQ Write PNG file" to store the images. But then when you open these stored images with a basic software (such as Paint) each pixel is coded onto 256 levels. Do you think I should turn "Use bit depth?" option to True ?
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I recently tried to upgrade RAM from 2x256 MB to 2x512 MB (PNY PC133 SODIMM 133Mhz). This worked at first and checking "About this Mac" indicated 1GB of RAM. But trying to use Safari or Firefox would freeze the computer and I'd have to hold the power button to reset. I put the original RAM back and now I can't get past the Gray Screen with spinning gear. I'm stuck at this screen with either set of RAM in. I tried to boot with the Apple Hardware Test disc, which worked and showed that everything was working fine (Logic Board, HD, & Memory included). Any suggestions?
thunderable and fantast1cdan
It sounds like both of your PowerBooks are suffering from a failed internal hard drive. If you have a cloned, fully bootable, backup on an external FireWire hard drive then try starting up from that. If that works then it suggests the PB's logic board is alright and the problem is most likely to be the hard drive.
If the failure is due, perhaps, to a software corruption then DiskWarrior might be able to resurrect it by repairing the directory.
On the other hand a complete erase and 'zero all data' might sometimes help as it will map out any bad blacks that are on the drive. Obviously to do this you need to be able to startup using the original installer disc - but that does not seem possible at the moment.
Alternatively if you have access to another FW-equipped Mac then try using FireWire Target Disk Mode to see if the drive can be accessed.
thunderable
Unable to eject properly, I unplugged the external drive and was able to reboot and get almost to the logon screen, but it wouldn't go any further. Since then I cannot get past the gray screen with the Apple logo and spinning circle.
Are you referring to the internal hard drive when you say that you were able to reboot almost to the login screen? Or were you trying to reboot from the external drive?
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How can I save the 12-bits gray scale image ?
Software & Hardware
NI-IMAQ Vision 6.0
NI-IMAQ for 1394 2.0.0
Hamamatsu C4742-95
I acqured the 12-bits gray scale image (Format7 , 640X512 size , 12bits) successfully.
And CWIMAQViewer display the correct image of which the range is from 0(black) to 4096(white).
But, I don't find the way to save this image with 12-bits format T.T
Always, CWIMAQVision object save this image to 8-bit format.
I tested all formats - tiff, bmp, aip, png.
I think there are two possible problems.
1. I dont't know the way to save the 12bits gray scale image. :{
2. I dont't know the way to read the 12bits gray scale image that saved correctly.
How can I save and load the 12-bits gray scale image ?
What is the solution for this problem T.T ?Hello,
I would recommend taking a look at the "ReadImage" Visual Basic project for more information on setting the image type and saving the image to file. When you run the program, make sure you select 16 bit for your image. You can also add another button to this example for saving the image. Within the click subroutine for the button, you can add the line:
CWIMAQVision1.WritePNGFile CWIMAQViewer1.Image, "C://image.png"
This method will save the image in the viewer as a png file. As long as it was loaded as a 16 bit image, it should save all of the 12 bit information into the file. You could then test the new image by loading it using the example (you can see the pixel values by right-clicking on the viewer and selecting Settings>>Show Image Info. The pixel value displayed in the info bar corresponds to the mouse position.
Best Regards,
Jesse D.
Applications Engineering
National Instruments
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