Black Sceen When Booting up my eMac

Does anyone know how to fix a BLACK SCREEN when booting up an eMac? The screen is totally black and the computer essentially gets stuck on this state and is unusable.
Thanks,
BESTFAMILY

Hello, does it sound like it's booting up at all?
What happens or shows if you hold Shift key or option key at bootup?
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.

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Lone_Wolf wrote:Checking bios settings would be good, especially look for something called "plug & play OS installed."
Should this be on or off?
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1 videocard
Lone_Wolf wrote:Another possibility :
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When i try going to the Bootmenu it hangs on a black screen ive taken out any hardware unpluged every thing from the usb slots front and back and it still hangs on a black screen when i try to go to the bootmenu
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http://h10025.www1.hp.com/ewfrf/wc/product?product=3339301&lc=en&cc=us&dlc=en&docname=c00864946

Hi,
Based on your other posts it appears that you have made some hardware changes. Is that correct? If that is correct then start backing off the changes until you can isolate the issue.
Since this is a new thread, please post the HP product number and operating system for your PC so that the members of the community can better assist you with your questions and issues.
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
HP Photosmart Premium C309G, HP Photosmart 6520
HP Touchpad, HP Chromebook 11
Custom i7-4770k,Z-87, 8GB, Vertex 3 SSD, Samsung EVO SSD, Corsair HX650,GTX 760
Custom i7-4790k,Z-97, 16GB, Vertex 3 SSD, Plextor M.2 SSD, Samsung EVO SSD, Corsair HX650, GTX 660TI
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Blue screen when booting from USB drive in UEFI mode (2013.07)

SOLUTION for me was to update the firmware on my ASRock mb as thatu pdate changed the EFI software (by American Megatrends) version from 2.00 to 2.31. However, other users are still experiencing the blue screen.
SHORT VERSION
When I try to boot Arch Linux 2013.07 with an USB drive in UEFI mode (for installation), I get a blue screen (which is rather a literal description and not a hint towards the old Windows' one) with the message
Failed to install override security policy (14): Not found
LONG VERSION
I made an USB installation media (product: Intenso Rainbow) by following this advice on the wiki.
I used the july release of Arch for that. First of, after installing the image to the USB stick I found that I needed to correct the label in the archiso-x86_64.conf file to ARCH_201307 (or was it the label of the usb stick, can't remember right now). (Pretty sure it was the same problem with "Linux Live USB Creator" which I used 3-4 months ago...)
After doing that, I rebooted and selected the entry
UEFI Intenso Rainbow
from this list of entries:
SATA HDJ ... something (the hard drive where Win 7 64 bit is installed with all programs)
SATA something (hard drive which only contains data)
Windows Boot Manager
USB: Intenso Rainbow
UEFI: Intenso Rainbow
It went to a blue screen with a message in white text saying
Failed to install override security policy (14): Not found
Below that was an OK button which had a black rectangle over it.
After I experienced the bluescreen, I tried booting the
USB Intenso Rainbow
entry and the boot process then worked fine, I got to that Arch menu where I could choose
Boot Arch Linux (x86_64)
Boot Arch Linux (i686)
Boot existing OS
Run Memtest...
and so on...
But just to make sure, I then did the check for UEFI mode according to this and only saw a folder acpi and ... something else I can't really remember, but it definitely was not efi. Thing is, I needwant to boot into UEFI mode as I have Win 7 already installed in UEFI mode.
Some info about my motherboard: it's from ASRock and is called H67M. The BIOS is dated to 2011-10-26 and is version 1.7.
So far, I only found a mention of the problem here at superuser.com.
Last edited by jones (2013-07-15 07:15:18)

Ok then, so this thread has also become about the blank screen problem when booting (in this particular case, Arch 2013.06 since 2013.07 seems to be worse).
srs5694 wrote:Typically, you adjust kernel boot options using your boot manager or boot loader. In GRUB, you hit the "e" key to open an editor. In rEFInd, you hit F2 or Insert twice. I don't recall offhand what key does the job for gummiboot (which I'm pretty sure the Arch installer uses), but I'm certain it's got the feature.
You are right. Thanks. I realized I had the gummiboot config right in front of me all the time. It's the file 'archiso-x86_64.conf' in \loader\entries (on Windows).
An addendum: I think the USB: Intenso Rainbow boot option takes me into a GRUB menu. Hitting 'e' in this "big" and fully designed menu didn't do anything IIRC. Hitting 'Tab' did the trick to get into editing the boot command line.
Hitting 'e' worked in the gummiboot menu though.
So I tried booting with the following options (also by combining some of them)
nomodeset
acpi_backlight=vendor
radeon.modeset=0 (I have a Gigabyte 7870 card in this desktop machien)
i915.modeset=0
but it did not help.
To be rather safe than sorry: I should mention that there are two grey-ish bars visible on the top and bottom of the screen after I try to boot the first entry, Arch Linux archiso x86_64 UEFI USB. Always has been with those two older Arch version (2013.05+2013.06). I also found another thread where one user talks about using the VGA port of the monitor, which I am currently not, I am using the DVI one, so that's worth a try too. EDIT It did not help either. What I did was setting the primary graphics adapter in the UEFI north bridge configuration menu to 'onboard' which worked immediately when rebooting (I hit the button labeled "Source" on my monitor and it showed it is using the "Analog" mode), but the problem just stayed the same. Adding aforementioned boot options or a combination thereof did not change anything.
Thanks for the e-mail addresses, I sent one to James Bottomley.
Last edited by jones (2013-07-07 11:12:05)

My Macbook Pro has a black screen when running in Bootcamp Windows 7. Since I updated the mac side my windows side now starts up with completely black screen - no prompt, nothing, Cap keys still light up as does mouse and DVD drive seems to run.

My Macbook Pro has a black screen when running in Bootcamp Windows 7. Since I updated the mac side my windows side now starts up with completely black screen - no prompt, nothing, Cap keys still light up as does mouse and DVD drive seems to run.
Will not show up in safe mode, will not show when started from Windows 7 DVD.
I suspect the Mac update wiped out my PC video drivers but can not think of a way to re-install?
Can see the PC volume from Mac side with files.
I've looked at all the online solutions so far and have tried most of them without success. Please help!
Specs:
2009 Macbook Pro, 3.06 GHz Intel 2 core, Max 10.6.8.
Model Name:          MacBook Pro
Model Identifier:          MacBookPro5,2
Processor Name:          Intel Core 2 Duo
Processor Speed:          3.06 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          6 MB
Memory:          4 GB
Bus Speed:          1.07 GHz
Boot ROM Version:          MBP52.008E.B05
SMC Version (system):          1.42f4
Serial Number (system):          7302300GANE
Hardware UUID:          B2D4B4B4-CD92-5C7A-BDC2-527D30DD8DF3
Sudden Motion Sensor:
State:          Enabled

EDIT: RESOLVED
For anyone else who finds their way here like I did, this link did it for me: https://forums.geforce.com/default/topic/527599/windows-8-issues-solved-please-r ead-if-you-39-re-having-black-screen-and-or-flickering-/
Specifically, the posts by Dunsany and valkyr did the trick. I booted in safe mode, uninstalled and deleted the Nvidia driver, disabled automatic driver installation, and restarted normally. I then manually downloaded and installed the previous Nvidia driver for my graphics card (which at the time of this writing was 335.23, rather than the latest which was 337.88), and everything is now bueno!
Two hiccoughs along the way: First, when I tried to uninstall the Nvidia driver the first time, when I restarted I got the login screen (which was a good sign), but it quickly went black again. I powered down, restarted in safe mode again, and repeated the uninstallation process, and it worked the second time. Second, when I started the manual install of the 335.23 driver, the computer played a sound similar to the one for disconnecting a USB device, and the screen went black. I'd seen a lot about trying to increase the brightness (though it hadn't worked up to this point; but if you haven't tried it yet, might as well); I tried it, and it worked! So far I'm back up and running. [/fingers crossed]
Hope this helps someone else!

R9 280x TF GAMING: Sporadic black screen on boot and system resume

Link to my full system specs
ASRock Z97M OC Formula (running latest BIOS version)
Acer B296CL Monitor over DisplayPort
MSI R9 280x 3GB TF GAMING, vBIOS 015.042.000.000.003435, S/N 602-V277-250B1406048461
AMD Catalyst Omega Driver: 14.501.1003.0 WHQL (latest non-beta driver)
When booting my computer in UEFI mode, occasionally, my monitor does not wake from sleep and the screen remains black until Windows takes over and the login screen displays. This seems to usually occur after the computer has been powered off for more than 10 minutes. Sometimes this never happens, the screen remains black the whole time, and I need to hard reset. Sometimes it boots fine.
This black screen / no signal issue also occurs far more frequently when attempting to resume from sleep. I strike a key on the keyboard or hit the power button while the computer is in sleep mode, the computer wakes up, but the monitor never turns on. This forces me to either hard shutdown or reset in order to restore graphics.
In addition, I have a Razer keyboard that shuts off its backlight when the display is turned off, and it remains off when this problem occurs. This likely means that there is a problem with the card, drivers, or something else, rather than cabling. I might just RMA if we don't get anywhere here.
Perhaps a good first step would be ensuring that my card is flashed with the latest vBIOS. Can you send a link to that?
I'm also wondering if ULPS might be interfering, even though I am not in a CrossFireX setup.
Other than this MAJOR issue, the card works fine when playing 3D games. Though, I had major issues with video artifacts when playing 2D games or doing anything else simple (web browsing, moving windows) because of the absolutely terrible decision to underclock the past couple generations of AMD cards so much that the GPU can't function. I solved this by modifying an OverDrive profile to raise the idle clock to 850 MHz, but not overclocking at all.
Thank you.
Meta discussion for the mods (feel free to PM me if you would like to discuss this further, in order to keep the discussion here on topic): sorry for not immediately opening up another forum topic when commenting on this issue. Every single other community that I've been a part of prefers to keep users with the same problem on the same thread. In my experience, mods yell at people for opening up duplicate bug reports and duplicate issues far more than they ask people to fragment information across multiple threads, therefore making it difficult to consolidate information.

It could be a mobo issue, but all of the quirks seem to point to the card.
I do not recall if I tested the card in another PC, but I no longer have a second desktop to test with.
I do think I tested an NVIDIA card on a separate Windows install with this build though. No issues there if my memory serves correctly. I've been troubleshooting this issue for months, and I'm becoming tired of this stubborn problem, so the attempts at problem-solving are becoming blurred.
vBIOS is attached.

Black Sceen When Booting up my eMac

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