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I have a iMac (27-inch, Late 2009). At power up I see the

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I have a iMac (27-inch...
I have a iMac (27-inch, Late 2009). At power up I see the white screen with an apple and the progress bar. After the progress bar is "complete" it then goes completely black. Can not see any hint of a display when looking up close. I have read some other Questions on the site (ie Command+Option+P+R ) with no luck
I have a new iMac now but hate to see this one go to waste.
Any quick thoughts as to what it is? Basically, cheap fix or $$$
Submitted: 1 year ago.Category: Mac
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Answered in 1 minute by:
10/6/2016
Mac Support Specialist: Richard, Apple Software Engineer replied 1 year ago
Richard
Richard, Apple Software Engineer
Category: Mac
Satisfied Customers: 39,529
Experience: IT Engineer for over 15 years
Verified

Hi there and welcome

Can you power off the Mac

then hold the SHIFT key and with it held, power on the Mac until you get to the sign in screen and then release it.

Tell me if you can then get to this please.

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Customer reply replied 1 year ago
I tried that. This time the screen went black midway thru the progress bar
Mac Support Specialist: Richard, Apple Software Engineer replied 1 year ago

Thanks

can you power it off.

Then remove all cables except the power cable.

Power it on and tell me please what then happens.

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Customer reply replied 1 year ago
I have no cables attached except keyboard and wireless mouse.
Not sure how you'd connect remotely
Mac Support Specialist: Richard, Apple Software Engineer replied 1 year ago

ok, then it is not this.

Power off the wifi router then try to start it please.

Tell me if it then starts (after enabling the router and getting internet again)

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Customer reply replied 1 year ago
same thing. Starts out white and goes black
Mac Support Specialist: Richard, Apple Software Engineer replied 1 year ago

ok, I know you tried this already but repeat the procedure another 2 times please

  1. Shut down your Mac.
  2. Locate the following keys on the keyboard: Command (⌘), Option, P, and R.
  3. Turn on your Mac.
  4. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
  5. Hold these keys until the computer restarts and you hear the startup sound for a second time.
  6. Release the keys.

After two times tell me if it then starts please

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Customer reply replied 1 year ago
I never get the "tah dah" start up sound. When I power it on it starts white with the apple and progress bar. I hear the HDD spinning and it goes blank before I see the finish of the progress bar. Then, it sits quiet and dark. the volume is "up".
Customer reply replied 1 year ago
Seems to be blanking out sooner as if the temperature has something to do with it. The more I try things the sooner it blanks out.
Mac Support Specialist: Richard, Apple Software Engineer replied 1 year ago

ok, can you attempt this please

Power off the mac

Then start the Mac and hold down the Command and R keys at startup.

Hold these keys until the Apple logo appears. After your computer finishes starting up, you should see a desktop with an OS X menu bar and an OS X Utilities window

choose Disk Utility from the Utilities window, or from the Installer menu if you're started from an installation disc.

Click the First Aid tab.

Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.

Select your Startup Disk (usually named "Macintosh HD").

Click Repair. Disk Utility checks and repairs the disk.

Let this complete and when it has, tell me if you still have the problem please.

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Customer reply replied 1 year ago
It goes blank almost immediately after the apple logo shows up. There is no way it makes it to the OS X menu.
I think were going down a dead end path. Perhaps the graphic/video card is shot
Mac Support Specialist: Richard, Apple Software Engineer replied 1 year ago

Thanks, ***** ***** confirmed the issue

It is the motherboard that has faulted. As it goes blank it points to the onboard power supply or voltage regulator. A bad video card would still leave it running but with a blank screen

I am really sorry about this and you are going to have to return the Mac to have this replaced. It will be covered by the warranty if this has not expired, and the replacement will be done at no cost to you.

I am really sorry about this, and if you have problems, or would like any additional information or assistance, please do not hesitate to let me know.

And if you can take a second to rate my service by clicking one of the stars at the top of the page, then submit, that would be greatly appreciated.

Thank you

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Customer reply replied 1 year ago
A bad video card would leave what still running? The computer is still running (I can hear it), but the display is "gone". The machine does not power off.
Mac Support Specialist: Richard, Apple Software Engineer replied 1 year ago

Ok, I thought when you said it went off that it was powering off. In this event if it is still running it can be the video card (which is onboard) or the chipset when it tries to initialize the devices. But both are part of the motherboard and still requires this to be replaced.

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Mac Support Specialist: Richard, Apple Software Engineer replied 1 year ago

If you would like any additional information or assistance, please do not hesitate to let me know.

Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.

Thank you

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Customer reply replied 1 year ago
the motherboard and the graphic board are one unit? Also, what is a chipset?
Mac Support Specialist: Richard, Apple Software Engineer replied 1 year ago

No, the motherboard is a board that holds all the components and the graphics and chipset along with the Bios, Sata ports are on this board.

Then rest of the components connect to it eg: Hard Disk

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Mac Support Specialist: Richard, Apple Software Engineer replied 1 year ago

ok.. I wont ask about the rating again. We are only compensated when you do a positive rating, but I asked a few times and it appears this wont happen.

Fair enough, that's your choice of course. You have the information you need

All the best

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Richard
Richard, Apple Software Engineer
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