Black screen for 45 secs before boot

Every time I start my computer, either cold start or a reboot, it takes 15 seconds before I hear the chime, and then it takes another 45 seconds before the grey screen with the Apple logo comes up. At about 43 seconds I hear the fan for my video card turn on. Once it's past that point, everything continues as normal.
I've only been noticing this for the last week. Perhaps that is because I just started using Boot Camp last week. Before that I only restarted for software updates, but I'm pretty sure this problem is new.
Here is what I've tried: repaired permissions on my boot drive; pulled each of my three hard drives from the tower, one at a time; reset PRAM; reset SMC; reinstalled factory memory.
None of these changed anything. Any ideas? I'm assuming it's a hardware problem since pulling the drives didn't change anything. Windows is on a different drive from the Mac OS, so I would think that if it was something with one of the drives, pulling them would have fixed the problem.

Have you tried running the apple hardware test, this should tell you if you have any issues with the actual hard drives themselves. Also diskwarrior to see if there's anything gone wrong with the OS.
Also found this
http://support.apple.com/kb/TS2600

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Hi hi,
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Black screen on system start, before boot.

This machine had a noisy cooling fan for some time, then the screen suddenly went black but could see very dimmed images on it when using a flashlight.
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@knetphils
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Thank you,
Omar
I Work for HP

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Hi,
When I start windows, after Windows 7 start logo, I get a black screen for about 20-40
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Hi，
Did you make any changes recently before this issue? Have you looked into the event viewer for any related recorded information? regarding to reinstallation, are you using a offical installation disc or an image customized by yourself? Any 3 rd party seervices
lauched on startup?
Unplug all the external devices, except mouse and keyboard and then restart the computer.
You can use this small tool Autoruns to check what is launched on a startup
http://technet.microsoft.com/en-in/sysinternals/bb963902.aspx
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VMware View Session go Black screen for some seconds

Hi Guys,
Recently one of my client is facing issues that VDI Desktop session is going black screen for few seconds and automatically session comes back. I have increased PCoIP Configure the PCoIP session Bandwidth floor to 200. still facing same issue.
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Black screen with white texts before Windows start in Boot Camp

I just bought my Macbook 13" and installed Windows Vista in Boot Camp. Everything went fine, Windows run seamlessly with the native speed that's said. My only problem is when I start Windows, it goes through a black screen first with a lot of white texts. One is the message "Unrecognized partition table drive 80. Please rebuild using Microsoft Fdisk Tool." Among others, this message repeats a number of times before Windows start. I don't have any problem after that, except that it delay the start up. I have tried to change a lot of settings that is associated with start up, so far nothing work. Can somebody out there help.

Highlight the phrase and add "Mac" to it, and do a look-up in Google.
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Hopefully that will help. But I would boot from Vista DVD and go through the automatic system repair too.

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The only other relevant Support document is this one: If your Mac won't turn on - Apple Support but if your Caps Lock LED illuminates when you press it then your Mac is not completely dead. Technically, it turns on, even though it appears to do nothing else. In that case Apple refers you to the following document: Troubleshooting: My computer has no video but I doubt it will help because you cannot even get your Mac to start.
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Mac Pro 3,1 Stuck on Grey screen for 1 min during boot

I have a Late 2008 Mac Pro 3,1 and have started experiencing a very slow boot up. The computer gets stuck for over a minute on the initial gray screen after the first boot chime. Once the apple logo finally appears the boot goes normally. Once running it seems OK. The shut down seems normal with a grey screen for a few seconds with the "clock" logo.
Symptom:
After the chime I see a blank gray screen for in excess of 1 minute, it used to last only a couple of seconds.
Once the dark grey Apple logo appears the boot goes at normal speed
I have a number of different hard drives with older systems and booting from each of then gives the problem - so it does not seem to be system/disc related
Two partitions (Mavericks and ML) are on SSD's installed on a Sonnet PCIe Card and showed the same problem as the spinning hard discs.
I tried: (following a trawl of the bb's etc)
I repaired permissions and repaired all discs for all my boot partitions (10.5, 10.6, 10.7, 10.8 and 10.9) using the appropriate Disc Utility
Zapping the Pram - this was very strange as I had to keep the cmd alt P R held down for around a minute before the second chime occurred, the time of the grey screen stays stuck
Resetting the SMC
Booting in Verbose Safe Mode: Again I had to hold the Alt V down for a minute on the gray screen before the screen went black and the text appeared
I looked on the console log but could see nothing obvious, additionally from the verbose safe mode boot the text log seems to start from when the grey screen disappears. The time stamps show the boot finishing in well under the minute I wait.
Any suggestions you may have are very welcome.
Regards
Dave

Thanks The Hatter for that information. The blank gray screen is now lasting 3 mins before the Apple appears. When I restarted the system log is as below. As you can see there is just over a three minute gap between the shut down and the boot, indicating to me that it is not something in the system software after the boot but a problem at the very start. It does look like it could be something to do with the hardware as you suggest. I have verified all the discs with the disc utility and they report as OK and their SMART status is also OK. I have disconnected the external drives with no change so I will now have to do a thorough check and systematically remove the internal ones but that will have to wait for the weekend.
I have Mavericks on the Samsung 840 Pro and ML on a Crucial SSD (Crucial_CT240M500SSD1 Media) on a PCIe card. The Mavericks install I think was an upgrade, not a clean install done quite a while ago. I only noticed the problem this week when I re-booted in an ML to run some software not compatible with Mavericks. I have made a system back up as a precaution to an external disc just in case my main drive is dying!
There are some firmware updates for both the SSD discs that I have not applied these yet but I will leave them out of the mix until I have tried simplifying my configuration with a single disc.
Apr 21 22:09:26 Davids-Mac-Pro.local shutdown[952]: reboot by _spotlight:
Apr 21 22:09:26 Davids-Mac-Pro kernel[0]: Kext loading now disabled.
Apr 21 22:09:26 Davids-Mac-Pro kernel[0]: Kext unloading now disabled.
Apr 21 22:09:26 Davids-Mac-Pro.local shutdown[952]: SHUTDOWN_TIME: 1429650566 934799
Apr 21 22:09:26 Davids-Mac-Pro kernel[0]: Kext autounloading now disabled.
Apr 21 22:09:26 Davids-Mac-Pro kernel[0]: Kernel requests now disabled.
Apr 21 22:09:26 Davids-Mac-Pro.local Mediatap[297]: XPC error messaging com.apple.IconServicesAgent: Connection interrupted
Apr 21 22:09:26 Davids-Mac-Pro.local Mediatap[297]: XPC error messaging com.apple.IconServicesAgent: Connection invalid
Apr 21 22:13:02 localhost bootlog[0]: BOOT_TIME 1429650782 0
Apr 21 22:13:04 localhost syslogd[18]: Configuration Notice:
ASL Module "com.apple.appstore" claims selected messages.
Those messages may not appear in standard system log files or in the ASL database.
Apr 21 22:13:04 localhost syslogd[18]: Configuration Notice:
ASL Module "com.apple.authd" sharing output destination "/var/log/system.log" with ASL Module "com.apple.asl".
Output parameters from ASL Module "com.apple.asl" override any specified in ASL Module "com.apple.authd".

WORK AROUND: Black screen/flashing cursor trying to boot windows cd

This refers to the black screen with flashing underline cursor in the top left corner problem that happens after using bootcamp to setup your partition & then rebooting with the windows install CD in the driver. Install never starts, you just get this black screen with flashing cursor. seems to affect many different types of macs attempting to boot both XP & Vista.
I tried rebooting about 10 times. No luck. Same problem. Tried running disk verify/repair after removing partition, no luck. Remade boot camp partition, no luck.
Finally I pointed Parallels (free trial available) to my blank bootcamp partition and set parallels to boot from CD before HD. Parallels booted the Vista install CD just fine, and put Vista on my HD. Crashed at the end though and said it couldn't make the boot camp partition bootable so all changes were removed. Rebooted under boot camp and the installer came up fine off the CD. I'm now running vista (SP1 even) under bootcamp just fine. Parallels just lets you get past that boot-up bug.
So if you have this problem, and nobody else can help, and if you can find it, maybe you can download..... Parallels.
Feel free to post this on the other threads. Unlike other workarounds I'm guessing this will work for everyone and it only takes a free trial download of parallels to give it a try. Just remember to setup the virtual machine to use the bootcamp partition as the target drive, and then go under the edit virtual machine, then OPTIONS, then BOOT tab and set it to boot from cd before HD. Switch it back when you are done.
Then run boot camp assistant again and select the install OS option. Should run the installer correctly (thus overwriting anything parallels put on the partition).
I think VMWare Fusion also supports vitualization with the bootcamp partition as the target so that may help you get around this problem.

I have resolved this issue for four of our iMac computers with either of the following solutions. I realize that these solutions might seem awkward, but these solutions have been the only solutions that have successfully resolved this same issue for four different machines.
Solution 1
On the Mac OS partition, leave the Boot Camp partition that has yet to be configured.
Leave the Windows install disk in the optical drive.
Shut down the computer.
Unplug all cables.
Hold the power button for a minimum of 5 seconds.
Plug in all cables.
Turn the power on.
The computer will proceed to install Windows.
Solution 2 (If Solution 1 fails)
On the Mac OS partition, leave the Boot Camp partition that has yet to be configured.
Remove the Windows install disk from the optical drive.
Shut down the computer.
Unplug all cables.
Hold the power button for a minimum of 5 seconds.
Plug in all cables.
Turn the power on.
A black screen will appear prompting for a bootable disk.
Load the Windows install disk.
Shut down the computer by holding the power button.
Turn on the computer.
The computer will proceed to install Windows.

Black Screen following install, can't boot back into Lion

Hi all,
I just tried to install Windows 7 Ultimate 64 via Bootcamp on my Late 2010 iMac (21").
Following installation (it completed installation fine) right before the part where the dialogue says 'Setting up your computer for the first time', the screen goes black and nothing appears to be happening.
I cannot boot back into Lion by holding Alt- it does nothing.
Holding C to boot from disk keeps brigning me to the same Windows Error Recovery screen where I am prompted to 'Start Windows Normally' or in the various Safe Modes.
Trying to start it normally results in this hanging black screen, trying to start it in safe mode results in a dialogue saying 'Setup cannot be completed in Safe Mode' and restarts the computer.
Obviously this is quite a tricky situation, I'd appreciate any help to make some part of my Mac usable again,
Thanks in advance for any input.
tl;dr:
Can't boot into Lion
Any action available to me in Windows results in the same loop of black screen hanging.
I'm not even sure where I can go to try and change any settings...

Reboot, hold the option key down when you hear the chime, release it when the boot manager appears. Select OSX as the startup. Once started go to Apple>System Preferences>Startup Disk and make OSX the permanent choice until you get the Winjunk running, even better, remove the Winjunk partition and stay in the light.
You might find it useful to read this, all kinds of basic information regarding OSX, no need to not know what to do next.

R5450-MD1GD3H/LP: Black Screen, endless reboots & No OS Boot

As written elsewhere (https://forum-en.msi.com/index.php?topic=159633.0), I have had strange problems about AHCI driver installation ..
..well,
I fix them in safe mode, but , I had a problem installing the catalyst drivers (fail message info by same CCC installer),
and the next reboot .. here is only black screen!
..the fans start spinning, but there is no boot of the OS!
The Mobo is a MSI P45 memory lover (no onboard VGA)
I tried using a MSI hd6450 and the system works ..
I tried the HD5450 on other platforms (775 and 1155), and the system does not work (even the onboard VGA is on at startup, if the 5450 present)
I think with the many reboots, CMOS reset, safe mode, system restore by Windows CD, the video card has a few voltage peak, or the drivers were not installed well have generated the fault.
I know that before it stop work, the video card was very hot on the big passive heatsink, because I feel it whit my finger (which is less than the hd6450 that I put after, because I feel it too)
then I ask you:
Do you think that the card is finally dead?
there is a chance for me to flash the original bios (on itself) with the MSI Radeon in these conditions?
thanks
max

Yesterday I have not had time to do the screen Ati flash, but will do it tomorrow ..
Today however I decided to buy a new fanless R5450 1Gb ddr3 ..
the model is slightly different than the previous, above the sink is no longer as big as that of the previous VGA that has failed ...
now,
I do not remember the average temperature of the working of the old VGA,
with an outside temperature of 37 degrees, the house will be nearly 30 degrees, do you think that is normal to have a temperature of 50 degrees on the new R5450?
Whereas, ..-as seen in images-that the CPU daily, (L3110 from a 45Watt tdp) remains at 31 degrees with a heat sink CM Geminii
I'm also thinking that the MSI P45 memory lover (which I bought on ebay germany USED)
may have some problems with the voltage phases of PCI-ex, and whether it was the cause of the failure of the previous video card..
(P. S. what section of the forum I can present the Worklog of my projects with MSI boards?)

Black screen for 45 secs before boot

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