Question about Apple 24" iMac Desktop

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White screen when I turned it on ten minutes ago, still hasn't started. Tried the option-command-p-r. Worked before for a blue screen. Is it working and will start up when it gets done?

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Try holding the power button down and keep holding till you hear an extended beep, then allow to start up normally this is like a heavy duty PR zap..... if that dosent work try booting up from your OS10 or techtool dvd holding down the C key during start up if boots from the DVD go to utilities then disk utilities and run it

Posted on Oct 06, 2010

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2 Answers

White screen on startup


Thank for contacting Fixya, I will be glad to assist you.

When experiencing an issue with booting up to a white screen, you can perform several steps to attempt to resolve this issue.

Option 1:

• First, hold in your power button for approximately 10 seconds to do a hard shutdown, if your Mac is not already turned off.

• Once your Mac is shutdown, you will need to perform what is called a PRAM reset (Parameter RAM)

• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously .

• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.

• Now, hold the keys down until the computer restarts and you hear the start up sound for a 2nd time.

• Release the keys and allow the Mac to start up.

If this procedure does not resolve your white screen issue, try this next option below.

Option 2:

-PMU RESET-
The Power Manager is an integrated circuit (computer chip) that is usually on the logic board of your Mac computer.

It is responsible for power management of the computer. It controls backlighting, hard disk spin down, sleep and wake, some charging aspects, trackpad control, and some input/output as it relates to the computer sleeping.

• If the computer is on, turn it off.
• Disconnect all the connections going into the Mac except for the Power cord.
• Once all connections have been disconnected, remove the power cord from the Mac.
• Wait 20 seconds.
• Reconnect the keyboard, mouse and power cord back into the computer.
• Press the Power button to restart the Mac computer.

Let me know if either of these processes help resolve this white screen issue.

Thank you.

Regards,

-The MacTechTrainer

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