Black Screen After Fans Run at Maximum

Hello,
I inherited an iMac and it an issue. It boots up fine but within the first five minutes the fans start to slowly ramp up to full speed. After about five to ten minutes of the fans running at full speed the screen goes black and I lose control of the computer. I cannot see anything on the screen, not even the cursor moving. I am also not able to shut down the computer using keyboard shortcuts. I have to hold down the power button.
The computer actually is still working to some degree after the screen goes blank because I have had a video playing from a USB stick and I could still hear the audio after the screen blacked out. I once had a Youtube video playing via the WiFi and when the screen went black the sound stopped.
I took the computer apart thinking that maybe it was full of dust. There was very little dust and blowing it out did not make a difference.
I have done a SMC reset and and a NVRAM reset and neither made a difference.
I installed a temperature monitor and the following is the output in degrees F a little before the computer goes to a black screen:
AC/DC Supply: 99
Airport Card: 141
Ambient Air: 76
CPU Heatsink: 93
GPU Die: 262
GPU Heatsink: 254
GPU Proximity: 223
Hard Drive Body: 102
LCD Proximity 94
Misc: 103
Optical Drive: 99
When the computer is running properly all four diagnostic LEDs on the logic board are lit. When the display goes black LED number 4 turns off leaving the other 3 on. Based on the Mac diagnostic instructions, if the fourth LED is off the issue is with the LCD panel or there is no video signal being generated.
I suspect that the video card is not working properly due to the high temperatures. It looks like the heat from the die is making it to the heatsink so I think that the thermal paste on the GPU is okay.
The computer is an iMac model EMC2134
OS X 10.8.5
24" Core 2 Duo with ATI Radeon HD2600 256 MB video card
I also ran EtreCheck and the output is below.
I would like to repair the computer even though it is old. I however do not want to bring it in to a repair shop. What do you think is the issue and what leads you to that conclusion?
Thank you,
jbr
EtreCheck version: 2.1.8 (121)
Report generated February 24, 2015 7:56:31 PM CST
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information:
    iMac (24-inch Mid 2007) (Verified)
    iMac - model: iMac7,1
    1 2.4 GHz Intel Core 2 Duo CPU: 2-core
    4 GB RAM
        BANK 0/DIMM0
            2 GB DDR2 SDRAM 667 MHz ok
        BANK 1/DIMM1
            2 GB DDR2 SDRAM 667 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: en1: 802.11 a/b/g/n
Video Information:
    ATI,RadeonHD2600 - VRAM: 256 MB
        iMac 1920 x 1200
System Software:
    OS X 10.8.5 (12F45) - Time since boot: 0:4:59
Disk Information:
    WDC WD5000AAKS-00V1A0 disk0 : (500.11 GB)
        disk0s1 (disk0s1) <not mounted> : 210 MB
        Big iMac (disk0s2) / : 499.25 GB (337.62 GB free)
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
USB Information:
    Apple Inc. Built-in iSight
    Alps Electric Hub in Apple USB Keyboard
        Logitech USB Optical Mouse
        Alps Electric Apple USB Keyboard
             Patriot Memory 7.92 GB
        PATRIOT (disk1s1) /Volumes/PATRIOT : 7.92 GB (7.62 GB free)
    Apple Inc. Bluetooth USB Host Controller
    Apple Computer, Inc. IR Receiver
Gatekeeper:
    Mac App Store and identified developers
Kernel Extensions:
        /Library/Application Support/Kaspersky Lab/KAV/Bases
    [loaded]    com.kaspersky.kext.kimul.44 (44) [Click for support]
        /System/Library/Extensions
    [loaded]    com.kaspersky.kext.klif (3.0.2d239) [Click for support]
Startup Items:
    Panasonic_LPD: Path: /Library/StartupItems/Panasonic_LPD
    Panasonic_MFS_PushServer: Path: /Library/StartupItems/Panasonic_MFS_PushServer
    Startup items are obsolete in OS X Yosemite
Launch Agents:
    [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [loaded]    com.adobe.CS5ServiceManager.plist [Click for support]
    [loaded]    com.hp.help.tocgenerator.plist [Click for support]
    [loaded]    com.kaspersky.kav.gui.plist [Click for support]
    [running]    com.logmein.logmeingui.plist [Click for support]
    [not loaded]    com.logmein.logmeinguiagent.plist [Click for support]
    [loaded]    com.panamfs.help.agent.plist [Click for support]
    [loaded]    com.panamfs.secureprint.agent.plist [Click for support]
Launch Daemons:
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.adobe.SwitchBoard.plist [Click for support]
    [loaded]    com.bombich.ccc.plist [Click for support]
    [running]    com.kaspersky.kav.plist [Click for support]
    [not loaded]    com.logmein.logmeinserver.plist [Click for support]
    [running]    com.memeo.Memeod.plist [Click for support]
    [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
User Launch Agents:
    [loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
User Login Items:
    LMILaunchAgentFixer    Application (/Library/Application Support/LogMeIn/LMILaunchAgentFixer.app)
    magicJack    Folder Hidden (/Applications/magicJack)
    autorun.ico    Windows icon image (/Applications/autorun.ico)
    AdobeResourceSynchronizer    Application Hidden (/Applications/Adobe Reader.app/Contents/Support/AdobeResourceSynchronizer.app)
    MemeoAgent    Application (/Library/Application Support/Memeo/Memeo LifeAgent/Agents/MemeoAgent.app)
Internet Plug-ins:
    JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Check version
    FlashPlayer-10.6: Version: 15.0.0.189 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.1
    AdobePDFViewerNPAPI: Version: 10.1.6 [Click for support]
    Flash Player: Version: 15.0.0.189 - SDK 10.6 Outdated! Update
    AdobePDFViewer: Version: 10.1.6 [Click for support]
    LogMeIn: Version: 1.0.465 [Click for support]
    SharePointBrowserPlugin: Version: 14.4.5 - SDK 10.6 [Click for support]
    iPhotoPhotocast: Version: 7.0
3rd Party Preference Panes:
    Flash Player [Click for support]
    Growl [Click for support]
    StuffIt AVR [Click for support]
Time Machine:
    Skip System Files: NO
    Auto backup: YES
    Volumes being backed up:
        Big iMac: Disk size: 499.25 GB Disk used: 161.62 GB
    Destinations:
        Mars Backup [Local]
        Total size: 499.76 GB
        Total number of backups: 26
        Oldest backup: 2013-04-09 03:34:37 +0000
        Last backup: 2013-06-25 21:20:55 +0000
        Size of backup disk: Adequate
            Backup size 499.76 GB > (Disk used 161.62 GB X 3)
Top Processes by CPU:
         5%    mds
         4%    WindowServer
         3%    mdworker
         2%    Memeod
         1%    kav
Top Processes by Memory:
    283 MB    kav
    215 MB    firefox
    47 MB    mds
    47 MB    Dock
    43 MB    WindowServer
Virtual Memory Information:
    2.24 GB    Free RAM
    1.27 GB    Active RAM
    268 MB    Inactive RAM
    518 MB    Wired RAM
    324 MB    Page-ins
    0 B    Page-outs
Diagnostics Information:
    Feb 24, 2015, 07:50:04 PM    Self test - passed

As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosened. Reinstall the RAM grille. Plug in the keyboard and mouse if not bluetooth. Insert power cord...
You are now in a perfect position to do a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
It is the 5 second timing that initiates the reset.
Here is a link to a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/

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I tried restarting in the firmware mode (command, option, O, F), no help.
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Black screen with fans running fast!

iMac A1311
I just got an iMac from a neighbor moving, when i turn on the computer, the screen stays black then the chime plays and after about 5 sec the fans kick in at full speed and stay at that speed.
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I did the most common steps for resetting
And they were?
Please detail ALL you have done so far in the way of troubleshooting? Need this info to avoid the been there done that scenarios.
Did you attempt any of the following in your steps?
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Which model iMac do you have? http://support.apple.com/kb/HT1758 How to identify iMac models
Which OS is installed?
================
When posting in Apple Communties/Forums/Message Boards.......It would help us to know which Mac model you have, which OS & version you're using, how much RAM, etc. You can have this info displayed on the bottom of every post by completing your system profile and filling in the information asked for.
Click on your name Welcome "your name."
Click on your name link
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Following software update allert on my MacBookPro (running Leopard, I think) it has been black screened and fan running for 4 hours now without restarting. What should I do?

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[Solved] Amilo XI 2550 - Black screen after fresh install

Dear archlinux users,
I have been reading the archlinux wiki and forums since I started using arch several years ago. It was always possible to solve the problems I ran into by consulting these webpages, therefore a big thanks to the community for the provided help.
Two weeks ago I installed arch on a Fujitsu Siemens Amilo XI 2550. The first problem I ran into was that booting the live-cd resulted in a black screen and I could not even start with installing arch. This problem was solved with the kernel parameter 'nomodeset'.
The first boot of the freshly installed arch also resulted in a black screen after the GRUB menu which was perfectly displayed. After some searching (here and here and ...) I plugged in an external monitor and it showed the login screen. I then installed KDE because I thaught the problem might not show up with X and KDE running. After the login to KDE I realized that the brightness of the laptop display is nearly black but not totally. It seems as if the brightness is at a very low level, but brightness cannot be controlled with the Fn+F8 or Fn+F9 commands. But I see a OSD that indicates that the controls are used but without effect. So at the moment it is only possible to work on the laptop with another display connected to it.
Maybe of use:
ls /sys/class/backlight/
acpi_video0
radeon_bl0
less /sys/class/backlight/acpi_video0/bl_power
0
less /sys/class/backlight/acpi_video0/actual_brightness
7
less /sys/class/backlight/acpi_video0/brightness
7
less /sys/class/backlight/acpi_video0/max_brightness
7
less /sys/class/backlight/radeon_bl0/bl_power
0
less /sys/class/backlight/radeon_bl0/actual_brightness
255
less /sys/class/backlight/radeon_bl0/brightness
255
less /sys/class/backlight/radeon_bl0/max_brightness
255
dmesg | grep drm
[ 0.736559] [drm] Initialized drm 1.1.0 20060810
[ 0.743608] [drm] radeon kernel modesetting enabled.
[ 0.743678] fb: switching to radeondrmfb from VESA VGA
[ 0.744054] [drm] initializing kernel modesetting (RV630 0x1002:0x9583 0x1734:0x1107).
[ 0.744065] [drm] register mmio base: 0xCFEF0000
[ 0.744067] [drm] register mmio size: 65536
[ 0.744172] [drm] Detected VRAM RAM=256M, BAR=256M
[ 0.744174] [drm] RAM width 128bits DDR
[ 0.744257] [drm] radeon: 256M of VRAM memory ready
[ 0.744259] [drm] radeon: 512M of GTT memory ready.
[ 0.744275] [drm] Loading RV630 Microcode
[ 0.744345] [drm] Internal thermal controller without fan control
[ 0.744386] [drm] radeon: power management initialized
[ 0.744389] [drm] GART: num cpu pages 131072, num gpu pages 131072
[ 0.762830] [drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
[ 0.762873] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 0.762874] [drm] Driver supports precise vblank timestamp query.
[ 0.762937] [drm] radeon: irq initialized.
[ 0.794780] [drm] ring test on 0 succeeded in 1 usecs
[ 0.795253] [drm] ib test on ring 0 succeeded in 0 usecs
[ 0.795942] [drm] radeon atom DIG backlight initialized
[ 0.795945] [drm] Radeon Display Connectors
[ 0.795947] [drm] Connector 0:
[ 0.795948] [drm] LVDS-1
[ 0.795950] [drm] DDC: 0xac0 0xac0 0xac4 0xac4 0xac8 0xac8 0xacc 0xacc
[ 0.795951] [drm] Encoders:
[ 0.795952] [drm] LCD1: INTERNAL_LVTM1
[ 0.795953] [drm] Connector 1:
[ 0.795954] [drm] DIN-1
[ 0.795955] [drm] Encoders:
[ 0.795956] [drm] TV1: INTERNAL_KLDSCP_DAC2
[ 0.795957] [drm] Connector 2:
[ 0.795958] [drm] HDMI-A-1
[ 0.795960] [drm] HPD1
[ 0.795961] [drm] DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c
[ 0.795963] [drm] Encoders:
[ 0.795964] [drm] DFP1: INTERNAL_KLDSCP_TMDS1
[ 0.795965] [drm] Connector 3:
[ 0.795966] [drm] VGA-1
[ 0.795968] [drm] DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c
[ 0.795969] [drm] Encoders:
[ 0.795970] [drm] CRT1: INTERNAL_KLDSCP_DAC1
[ 1.278449] [drm] fb mappable at 0xD0141000
[ 1.278451] [drm] vram apper at 0xD0000000
[ 1.278453] [drm] size 9216000
[ 1.278454] [drm] fb depth is 24
[ 1.278455] [drm] pitch is 7680
[ 1.278527] fbcon: radeondrmfb (fb0) is primary device
[ 1.726069] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device
[ 1.770030] [drm] Initialized radeon 2.39.0 20080528 for 0000:01:00.0 on minor 0
Until now and amongst others I tried the following things.
Using kernel parameters
video.use_native_backlight=1
video.use_native_backlight=0
acpi_osi=linux
acpi_backlight=vendor
and others I just cannot remember.
Masking backlight
systemctl mask systemd-backlight@backlight:acpi_video0.service
systemctl mask systemd-backlight@backlight:radeon_bl0.service
Setting bl_power
echo 1 > /sys/class/backlight/acpi_video0/bl_power
echo 1 > /sys/class/backlight/radeon_bl0/bl_power
Nothing of the above was improving the situation.
Your help on the problem would be highly appreciated.
Best regards
mgs
Last edited by mgs (2014-10-27 10:15:11)

Hello Trilby,
thanks for the reply.
Trilby wrote:If nomodeset worked with the installation medium, why haven't you tried that for the same problem on your installed system?
The kernel parameter 'nomodeset' results in a working display but without X support, due to the fact that with 'nomodeset' there is no KMS support and therefore no X. But nevertheless I tried it and as expected X did not start.
Trilby wrote:Could you also post information about your graphics card and what drivers you've installed.
The graphics card is a Radeon HD 2700 and according to the above dmesg log it is recognized as RV 630. The radeon module is loaded via /etc/mkinitcpio.conf and xf86-video-ati (1:7.5.0-1) is installed.
I hope the provided information is what you asked for, thanks for your help.
Best regards
mgs

Lenovo G560 - Issue with won't boot and black screen after HDD upgrade

Lenovo G560 - Issue with won't boot and black screen after HDD upgrade.
What happen: My laptop was working fine, no blue screen issue, no funny business at all. I bought a new SSD Intel 120 GB and thought it would be a good idea to replace the HDD. I shutdown and disconnected the power adapter, waited a couple of minutes and removed the battery. I opened up the back case and replaced the HDD. And put all the screws back and put the battery back in.
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I have tried these:
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Thoughts and suggestions?
Solved!
Go to Solution.

Hi Autoexit173,
Welcome to Lenovo Community!
As per the query we understood that you are facing issue with system not booting in your Lenovo G560 laptop.
As you have mentioned that the system not booting, please try to remove the RAM and turn on the system and check if you can hear any beep sound. Also try to clean the RAM slots and check for the issue.
Click here for the steps to remove the RAM and refer page number 40.
Hope this helps. Do post back if issue persists!
Best regards,
Ashwin.S
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Thanks to help me to do not let me switch....
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The Windows Desktop Perfmon and Diagnostic tools forum is to discuss performance monitor (perfmon), resource monitor (resmon), and task manager, focusing on HOW-TO, Errors/Problems, and usage scenarios.
As the question is off topic here, I am moving it to the
Where is the Forum... forum.
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This problem is solved...
I guess the problem is concerned with the display module controller in the BIOS which is having a slight compatibility issue with windows 8.
This issue is solved by updating the BIOS of your Laptop/PC to the latest version. You can download the latest BIOS from the website of the Laptop company/Motherboard Company.
But for updating the BIOS, you have to start your computer/Laptop for at least one time in Normal Mode. So here are the steps to do so...
1) Boot the Laptop/PC.
2) After the boot screen (The Circle Animation & Windows 8 logo), you will be presented by the lovely & awesome blank screen.
3) Wait for 1 minute so that drivers load into the memory.
4) Press the Power button of your laptop/PC for only a moment (Just Press and release it quickly. Don't hold. We don't want to shut down).
5) This will force the laptop/PC to go into Sleep mode.
6) When the laptop/PC goes in sleep, the laptop fan & other sounds will stop.
7) After 4-5 seconds, press the power button again & release it quickly.
8) Voilllaa!!! The laptop/PC starts & you are presented with the lock screen. Now..... Login! What are you waiting for! :P
This is not the permanent solution. It just lets you start you Laptop/PC.
After updating the BIOS, I strongly suggest that you must download the latest graphics driver for your Computer/Laptop to avoid any further issues.

HP Pavilion DV3 41700-EE Problem-Black Screen after installing graphic card driver

Hi,
Laptop Model : HP Pavilion DV3 41700-EE Entertainment series.
I download the latest official driver for my lap top from this link : http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=ob-93326-1&cc=us&dlc=en&lc=en&...
After the installation i rebooted my device and after the windows loading i got a black screen ! i went to safe mode and unistall the video card and also it's driver from device manager and when i came back the black screen was gone but i have only my onboard Integ graphic which is very slow.
also i went to AMD web site and get AMD Catalyst from their web site but nothing happened after the installation and i think they don't provide an appropriate driver for my lap top.
i also tries to go to device manager and with right click on my display adapter and update driver point to the display driver location on my syste but this time it does not take time the black screen after restart, and in the middle of installation i got a black screen.
Also i upgraded my BIOS Firmware from 16 to 24, but nothing changed.
i just wanna know is it a software problem or hardware problem ? how can i find out that ?
also i don't want this switchy manner and i don't care about the power efficency. i just want to my device work on maximum performance.
What you suggest i do ?

Use the recovery manager to reinstall the original AMD graphics driver and Catalyst Control center.
****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

Black screen after BIOS update

Hi there,
After updating BIOS with regular HP software (i forgot the name now), the computer shut down and from that moment when i turn it on the screen stays black (with computer apparently running). I read so many posts with similar problems and i tried few things but without success. I know that i am very close to solve the problem but from all the suggestions i am now simply confused. I would like to ask, if someone can guide me through step-by-step procedure, i figured out that i need to install a BIOS version on USB-stick, but exact details i am obviously missing.
I have HP Pavilion dv 6700 Entertainment PC and new HDD inside without HP_TOOLS on it.
Thank you veeeeeryyyy much!

Hello @milence,
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 computer is experiencing a black screen after updating the BIOS, and I would be happy to assist you in this matter!
To return the BIOS back to factory default settings, I recommend following the steps in this document on Restoring the BIOS. If the issue persists, please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region.
http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
I hope this helps!
Regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

MSI R9 270X - Black Screen after Win7 logo

Hello there.
About a week ago I upgraded my PC, buying several components and putting it to work. Here's the specs.
Main Board: M5A97 EVO R2.0
Bios Version: Latest
Video Card: MSI Radeon R9 270X TwinFrozr OC Edition 2Gb
PSU: Don't know
12v rail Rating of listed PSU:
CPU: AMD FX 8350 4.0Ggz BE SkAM3+
Memory: 8Gb Crucial Ballistix DDR3-1600Mhz
SSD/ HDD: Western Digital WD10EZRX-00A8LB0 1TB
CPU COOLER: The one that came with the CPU
Raid Card: Onboard
Sound Card: Onboard
OC: (Yes / No) Don't know
Operating System: Win 7 SP 1 64
So, it worked just fine for about 3 days. Last Saturday night I tried to open Google Chrome after some gaming and the the system froze. I got a screen with vertical black and white stripes. I had to reboot the system and it gave me a black screen, crashing again, after the Win Logo at start up. At this time I was running either 14.7 or 14.9 ATI drivers.
I could only start the PC on Safe Mode. Removing the drivers and getting Windows general VGA card settings would allow me to use Windows in normal mode though. Once I installed the Graphic Card's drivers it crashed on reboot, always with the black screen after Win logo. I installed several ATI drivers, namelly 14.9, 14.11 beta, 13.12... and nothing worked.
I flashed the Mother Board BIOS to the latest version, formatted the HDD doing a fresh install of Win 7, installed Catalyst first and then the drivers, the drivers without catalyst, etc. and nothing worked, always getting a black sreen on reboot once the Graphic Card's drivers were installed. I even swapped the Graphic Card to a different slot to no avail.
Right now I'm using my old Radeon HD 5670 with the latest drivers and everything works just fine. It even works fine if I keep both Graphic Cards installed with the monitor plugged to the older card. I find this odd since to do so, Windows loads both cards drivers with no errors. But once I switch to the new card everything goes black.
Can someone help me out? I've tried to contact my vendor's technical support through mail but they're not answering. I fear that I'll have to report it as DOA and swap it out, which will take quite some time taking into consideration the way things tend to work around here.
EDIT - I don't have a 2nd system to test it on.

Nope. Not driver issue at all. I tested at least 3 different drivers, all with the same result. Besides, I used both Driver Fusion and Driver Cleaner and CClean to remove any non-deleted registry entries. Always got the same problem. Went as far as formating the drive and doing a clean Win install. The problem persisted.
Tried installing drivers without Catalyst to no avail. Tried installing Cataltst first and then the drivers. Nothing. It always crashed omce the drivers were installed.

My Imac 24" goes black screen after start up. Booting from original CD or CMD R don't work, both go black screen

So, yesterday while playing a game of league of legends my Mac stopped running. After I resetted it, I got black screen after it the chime + loading bal.
So far I've tried:
CMD+R => black screen
Holding shift => black screen
Holding Alt => chosing the HR, the repair disk, or the original CD to reintsall => black screen
Holding S => got to the terminal, did the check up, it said it was ok, restarted => black screen
Took off the power cable, waiting at least 15 seconds, and everything back on => black screen
Holding Alt Cmd + p + R => black screen after restart
Removed 1 of the memories, then testen, same with the other one => black screen
I'm pretty much out of ideas at this point. Anything I've overlooked?

Any white text?
Startup - Black Screen/White Text
Startup – Red Screen
Startup Issues - Resolve
Startup Issues - Resolve (2)
Startup Issues - Resolve (3)
Restart the computer holding down the command - option/alt - P - R keys before the grey screen appears. Continue to hold until you hear the startup chime for the second time.
Reset NVRAM/PRAM
Try a SMC reset. The article covers when this is required, but doing this will not affect anything.
Reset SMC

Black Screen After Fans Run at Maximum

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