Question about Apple STUDIO DISPLAY 21" Monitor

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Monitor is black at start up

Led blinks green but won't come on. I've switched out monitors and it's not the monitor. I also replaced the video card , no good. Power supply is 300 watts and I was told that could be the problem. Any help would be appreciated. Jimcoco

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I have a IC cn5560 I removed the battery on the motherboard in an attemt to reset the bios.Now all I get is a black screen.The system is not amack it is xp>How do I reset The opperating system? Jp

Posted on Dec 15, 2007

  • joel pitts Dec 15, 2007

    what are Command and option button?


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Do you hear any noise at all on start up? Drive spin?

Power supply could be the problem but have you tried replacing the PRAM battery or at least zapping the PRAM?
Press start and immediately hold Command+Option+P+R and wait for two or three chimes, then let go.

Or try resetting your NVRAM in Open Firmware:

Start up with the Cmd+Opt+O+F keys depressed.

When the open firmware screen appears, type in the following after the "0 >" prompts:

0 > reset-nvram
Press Return
0 > reset-all
Press Return

After pressing the second return, the Mac should restart on it's own if the rest was successful. If not, enter the following to restart, or simply power down with the power button:

0 > mac-boot
Press Return

Or try removing the battery (if you know it's good) for 20 minutes, then replace. (Does the same as NVRAM reset)

You can also try resetting the SMU or CUDA button depending on which machine you have.

If you have the machine starting up OK but no video, don't forget the possibility that the video cable could have a problem like a bent pin.

Posted on Nov 16, 2007


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Posted on Jan 02, 2017

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