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 Johnny Mack Your Own Question

Johnny  Mack
Johnny Mack, Mac Support Specialist
Category: Mac
Satisfied Customers: 1353
Experience:  6 years repairing macs and ipods and 3rd level tech support
28647879
Type Your Mac Question Here...
Johnny Mack is online now
A new question is answered every 9 seconds

I was reading about what you wrote to someones question about

Customer Question

I was reading about what you wrote to someones question about iMac starting up to a black screen. I have that problem and I am able to divert the main screen to an external monitor. So the computer works fine, just the screen is black. Is there anything I can do to get the screen back before taking it to the Apple Store?
Submitted: 1 year ago.
Category: Mac
Expert:  Johnny Mack replied 1 year ago.
Hello there! My name is***** and I will be assisting you today. Follow the steps below to try and reset your video card.
1. Disconnect power.
2. Hold power button for 20 seconds ( atleast)
3.Press and hold the Command-Option-P-R keys
4.then turn on your mac
5.make sure to hold these keys till your mac resets 4 times.