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 Ashik Your Own Question

Ashik
Ashik, Mac Helper
Category: Mac
Satisfied Customers: 6792
Experience:  7+ Years of Experience in troubleshooting Macs, iPhone, iPad, iPod etc
16433418
Type Your Mac Question Here...
Ashik is online now
A new question is answered every 9 seconds

Problems with LG LED 42" TV and Mac Mini

Resolved Question:

Hello, I have an LG LED 42" TV and I am trying to set it up as a monitor for my Mac Mini running Mac OS Lion. Somehow I changed the resolution on the screen preferences window and now I get an "Invalid Format" on the LG TV. I've tried rebooting in safe mode and changing the resolution and that works, but as soon as I boot in normal mode I get the Invalid Format message. What can I do?

Submitted: 1 year ago.
Category: Mac
Expert:  Ashik replied 1 year ago.
Hi and Welcome. My Name is XXXXX XXXXX I look forward to assisting you today with your question.

Before we start, please remember these things. It may take more than one step/answer to solve a problem. So If my answers didn’t work or if you are not satisfied, please don’t Rate my answer as Bad or Poor Service, but please Reply back to me by clicking the “Continue Conversation” or “Reply” button and I will gladly continue to help. Remember, you are rating my Service to you and Not the Outcome of the answer or this website.


Change the resolution to a lower resolution from Safe Mode (not to the default one). Then turn off your Mac and reset the PRAM and NVRAM. Follow the steps below to reset the PRAM and NVRAM

  1. Shut down your Mac
  2. Locate the following keys on the keyboard: Command(Apple), Option, P, and R.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears and before the chime sound.
  5. Hold the keys down until the computer restarts and you hear the startup sound for three times.
  6. Release the keys.


Then restart your Mac in Safe Mode again and change it to another resolution (to a one above the lower). Then restart your Mac (not to Safe Mode) and then change the resolution to a anything below to the highest resolution. Again, restart and then change to the highest resolution or to your preferred one.

Please let me know if that didn't work, so we can continue troubleshooting. Don't Rate my answer until you are satisfied.

Customer: replied 1 year ago.

I tried it but i only heard two start up sounds instead of three. Should i try it again? i must say it is a hard key combination to hold with only one hand

Expert:  Ashik replied 1 year ago.
Two startup sound is OK. Your PRAM and NVRAM is reset. Now try the remaining steps.
Customer: replied 1 year ago.

I just finished start up in normal mode and I get the invalid format again.


I will try it again from the beginning


 

Expert:  Ashik replied 1 year ago.
Ok..If that didn't work, we can reset the System Preferences settings to default.Boot into Safe Mode again, on finder, Hold down Option key on your Keyboard, click on Go menu in the top and select Library. This will take you to the Library folder of your User Account. Open Preferences folder.

Trash the file "com.apple.systemprefernces.plist" from there. Restart your Mac. Let me know if that didn't work
Expert:  Ashik replied 1 year ago.
Also, Goto Macinosh HD > Library > Preferences > SystemConfiguration folder and trash this file too : preferences.plist

Then restart.
Customer: replied 1 year ago.

ok, i will delete this one too.

Expert:  Ashik replied 1 year ago.
Let me know how it goes.
Customer: replied 1 year ago.

sorry, i was looking for it in the wrong place. I found it and deleted it.

Expert:  Ashik replied 1 year ago.
After deleting it, restart in normal mode. Did that work ?
Customer: replied 1 year ago.

I restarted in normal mode but i get the invalid format again


 

Expert:  Ashik replied 1 year ago.
I'm getting out of ideas. Boot into Safe Mode again, goto System Preferences and open Users and Groups. Then create a new administrator account in there. Then restart your Mac and boot into the new administrator account. Does your Mac recognize the monitor ?
Customer: replied 1 year ago.

Ok, I will try it.
But if it doesn't work can we go through your first suggestion step by step? I'd like to give it one more try.


The thing is that earlier today it worked just fine; just that the screen was a little bit off centre so I thought the resolution was incorrect. I tried several options; some worked others gave the invalid format. But after a few seconds the screen came back to the previous resolution. It is just that I don't know when i clicked on the keep settings button and it screwed everything up.

Customer: replied 1 year ago.

OK, so far so good. I logged in to the new Admin user and the TV is recognised.
Now, will this work with the other two previously existing users?

Expert:  Ashik replied 1 year ago.
Sure. Unsupported resolutions will really mess up some settings of current account. My first suggestion will confuse your Mac to use default settings, then it allow to change the resolutions to correct one. Lets try again.


Step 1 : Reset the PRAM and NVRAM again (hold down those buttons for 10 seconds)

Step 2 : Restart your Mac in Safe Mode and delete those files I mentioned above

Step 3 : Change the resolution to a working one (select smaller resolution number here)

Step 4 : Restart your Mac to Safe Mode again, select another resolution. Restart into old account. Did that work ?
Ashik, Mac Helper
Category: Mac
Satisfied Customers: 6792
Experience: 7+ Years of Experience in troubleshooting Macs, iPhone, iPad, iPod etc
Ashik and 6 other Mac Specialists are ready to help you
Expert:  Ashik replied 1 year ago.
Not sure, try logging into old account. If it still not working, then backup all your files from your old account to a External drive from Safe Mode, login to the new account and copy the files back to your new account from the external drive. The settings of your old account must be messed up.
Customer: replied 1 year ago.

I logged out from the new user and have tried the previous ones.


It works!!!!
I had been breaking my head for almost 3 hours before finding just answer.com
Thank you so much.


 

Expert:  Ashik replied 1 year ago.
I'm glad you got it worked and Glad I could help you. Add a bookmark of this page, so you can refer this thread anytime if it happens again or you can get back to me anytime you want through this thread.

If you like my service, please rate me as Excellent Service.

Happy New Year,
Ashik

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
 
 
 
Chat Now With A Mac Support Specialist
Ashik
Ashik
Computer Technician
5576 Satisfied Customers
7+ Years of Experience in troubleshooting Macs, iPhone, iPad, iPod etc