How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Claws224 Your Own Question

Claws224
Claws224, IEEE Datacommunication Engineer
Category: Mac
Satisfied Customers: 5182
Experience:  IEEE, Microsoft
Type Your Mac Question Here...
Claws224 is online now
A new question is answered every 9 seconds

My Imac has a black screen when I start it up

Resolved Question:

My Imac has a black screen when I start it up
Submitted: 4 years ago.
Category: Mac
Expert:  Claws224 replied 4 years ago.

Hi,


Can you tell us i it is a blank black screen or is there any writing on it?

 

Thanks

Customer: replied 4 years ago.
All blank, black screen, no writing
Expert:  Claws224 replied 4 years ago.

Ok,

 

Can you press and hold down the power button on your iMac till it shuts off, Once you have done that can you then find the Command, Option, P, and R keys on your keyboard.

 

Once you are ready can you turn on the machine and then press and hold the Command+Option+P+R keys at the same time and hold the keys down until you hear the startup chime 3 times then let go of the keys and let me know if the machine will now startup properly or if you still have the blank black screen.


Thanks

Eric

Customer: replied 4 years ago.
No chimes at all, still completely black screen
Expert:  Claws224 replied 4 years ago.

Ok,

 

When you press and hold down the power button does the Mac turn off and does the screen appearence change at all or is it the same black screen, I am not sure if my question will make sense, however I am trying to find out if the screen seems to power up.

 

If the screen seems to dim when you turn the machine off can you then disconnect everything from the iMac and remove the power plug from the machine then press and hold the power button down for a full 30 seconds then reconnect the power, mouse and keyboard only then wait 5 seconds and let me know if you can now startup and press Command+Option+P+R like before till you hear the chime 3 times.

 

If nothing happens can you tell me what does happen when you try to power up the machine?

 

Let me know.

 

Thanks

Eric

Customer: replied 4 years ago.
When I powered it up, nothing happens with the screen at all, it stays black. All you hear is the hum of the motor.
Expert:  Claws224 replied 4 years ago.

Ok,

 

This will sound stupid, However when you try to power it up does the screen look like the black is lighter as though the screens backlight is lighting up?

 

If you can power it off then turn off the lights in the room and then power it up can you tell me if the screen seems to glow?


Thanks

Customer: replied 4 years ago.
No glowing at all, just black
Expert:  Claws224 replied 4 years ago.

Ok,

 

Can you power up your Mac and then wait about 2 minutes and look very closely at your screen and let me know if you see a shadow of a display, Either that or take a flashlight and see if you can see a ghost image on your iMac's screen and let me know


Thanks

Eric

Customer: replied 4 years ago.
No ghost image at all.
Expert:  Claws224 replied 4 years ago.

Ok,

 

Has your Mac been acting strangely at all recently?

 

If not can you tell me what model of iMac it is?


Thanks

Customer: replied 4 years ago.
Has not been acting strangely at all. Has been on screen saver mode for a few days. Has not been used much at all the past 4-5 days. its the original 21 inch Imac..The first Imac they came out with.
Expert:  Claws224 replied 4 years ago.

Ok,

 

Can you look on the base and let me know if you see a model number like M9290LL/A

 

If not can you confirm it is the model with the white domed base?

 

Thanks

 

Eric

Customer: replied 4 years ago.
No, it is the all gray base and outline around the screen
Expert:  Claws224 replied 4 years ago.

Ok,


So it looks like this

 

graphic

 

Is that correct?

 

Thanks


Eric

Customer: replied 4 years ago.
Yes that is the one.
Expert:  Claws224 replied 4 years ago.

Ok,

 

In that case there is only one other thing we can try to check, So can you tell me if you have an external monitor and a video output cable for your iMac?

 

If so can you power off your iMac and conect the external monitor then power it up and let me know if you see anything on the display.

 

This way we can see if it is the graphics card that has failed or if it is the LCD that is having the issues.

 

Let me know what happens.


Thanks

Eric

Customer: replied 4 years ago.
I don't have an external monitor.
Expert:  Claws224 replied 4 years ago.

Ok,

 

Do you have another Mac and a firewire cable?

 

Thanks

Customer: replied 4 years ago.
yes I do
Expert:  Claws224 replied 4 years ago.

Great,

 

On the problem machine can you shut it down then wait 5 seconds and power it back up and immediately can you press and hold down the T key for about 1 minute so the machine will hopefully open in target disk mode.

 

Then can you then connect the firewire from the problem machine to a running mac and the hard drive should mount as an external drive and show on your desktop.

 

Let me know if the problem Macs drivve mounts on your desktop or not as this will tell us if the LCD has failed or if it is the graphics on the logic board.


Thanks

Eric

Customer: replied 4 years ago.
It did not show up on the good mac.
Expert:  Claws224 replied 4 years ago.

Ok,

 

In that case it would indicate that there is a possible issue with the graphics or with the main logic board on the machine, The trouble is that there is very little more we can do in this format to help you troubleshoot beyond this point.

 

Honestly the best thing to suggest from here would be to take it to your local Apple store and have them troubleshoot the hardware for you as the only other option would be to change out the logic board and graphics which can be rather expensive and involved.

 

Let me know what you prefer to do.


Thanks

Eric

Claws224, IEEE Datacommunication Engineer
Category: Mac
Satisfied Customers: 5182
Experience: IEEE, Microsoft
Claws224 and 5 other Mac Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Hi John, Thank you for your expertise and, more important, for your kindness because they make me, almost, look forward to my next computer problem. After the next problem comes, I'll be delighted to correspond again with you. I'm told that I excel at programing. But system administration has never been one of my talents. So it's great to have an expert to rely on when the computer decides to stump me. God bless, Bill Bill M. Schenectady, New York
< Last | Next >
  • Hi John, Thank you for your expertise and, more important, for your kindness because they make me, almost, look forward to my next computer problem. After the next problem comes, I'll be delighted to correspond again with you. I'm told that I excel at programing. But system administration has never been one of my talents. So it's great to have an expert to rely on when the computer decides to stump me. God bless, Bill Bill M. Schenectady, New York
  • The Expert answered my Mac question and was patient. He answered in a thorough and timely manner, keeping the response on a level that could understand. Thank you! Frank Canada
  • My Expert answered my question promptly and he resolved the issue totally. This is a great service. I am so glad I found it I will definitely use the service again if needed. One Happy Customer New York
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
 
 
 

Meet The Experts:

 
 
 
  • Mike

    Mac Medic

    Satisfied Customers:

    6256
    Over 20 years IT experience with Apple computers in publishing, marketing and design.
< Last | Next >
  • http://ww2.justanswer.com/uploads/macthelife/2009-10-20_1899_mikesebaharsquare64.jpg Mike's Avatar

    Mike

    Mac Medic

    Satisfied Customers:

    6256
    Over 20 years IT experience with Apple computers in publishing, marketing and design.
  • http://ww2.justanswer.com/uploads/AS/ashiknasameen/2012-5-15_141836_final2.64x64.jpg Ashik's Avatar

    Ashik

    Mac Helper

    Satisfied Customers:

    5282
    7+ Years of Experience in troubleshooting Macs, iPhone, iPad, iPod etc
  • http://ww2.justanswer.com/uploads/DP/dpean/2012-6-6_172828_avatorme1.64x64.JPG Daniel's Avatar

    Daniel

    Mac Genius

    Satisfied Customers:

    4670
    Apple certified on desktop and portable, help desk qualified. Have owned and used Macs since 1989.
  • http://ww2.justanswer.com/uploads/VI/vinodvmenon2005/1.64x64.jpg Vinod Menon's Avatar

    Vinod Menon

    Support Specialist

    Satisfied Customers:

    2068
    worked as a Tech support Associate for Apple products
  • http://ww2.justanswer.com/uploads/BE/beboo/2011-1-14_201648_n5063313142021801763.64x64.jpg Brandon M.'s Avatar

    Brandon M.

    Mac Support Specialist

    Satisfied Customers:

    1501
    10+ Years Mac Support as contractor and currently an IT Manager for law firm
  • http://ww2.justanswer.com/uploads/MA/MacDruid/IMG_0232.64x64.JPG John T. F.'s Avatar

    John T. F.

    Mac Druid

    Satisfied Customers:

    1408
    20+ years in the computer/Mac industry
  • http://ww2.justanswer.com/uploads/MA/MacHelpdesk/1d2d506.64x64.jpg David's Avatar

    David

    Mac Support Specialist

    Satisfied Customers:

    1236
    BSc, H.Dip, Apple Certified
 
 
 

Related Mac Questions