Question about Apple iMac Computers & Internet

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Black and White Horizontal Lines

Went away from computer for a couple of hours, upon return the screen was white. Turned it off and restarted. Screen was white with apple for a few minutes, then went to white screen and now has black and white horizontal lines with rectangular white/black boxes throughout pattern. Computer is unresponsive. What does this mean?

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  • Master
  • 368 Answers

Sounds like the graphics card just died. You will need that repaired.

Posted on Apr 15, 2014

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SOURCE: Screen Changes and Comupter freezes

It may be possible that the power supply, display and or logicbpard may be having issues. Apple recommends resetting the pram and nvram. If issue persists reset SMU. YOur machine is 6 months outside of the original warranty, but if you purchased the 3 year extension plan, you may want to take action on it.

http://search.info.apple.com/index.html?q=imac%20g5%20reset%20pram&lr=lang_en&search=Go&type=

http://search.info.apple.com/index.html?q=imac+g5+reset+smu&type=&search=Search&lr=lang_en&search=Go

Keep me posted.

Posted on Nov 11, 2007

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SOURCE: white vertical line going through my IMAC screen

The line is an indication that there is a failure in the display, most times the failure will be limited to the line you see but occasionally the problem will spread, causing more lines. the only way to fix it is to have the display replaced.

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SOURCE: inch wide vertical white band on my Imac screen?

If the white band appears right from start up, the display needs to be replaced, if it comes on after it starts, it is most likely a software problem.

Posted on Feb 22, 2009

KenKaBob
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SOURCE: Resolution issue Acer V223w

Hi, I'm sorry to hear you are having trouble....
THis is a tricky one. My first step would be to connect another screen to your G5 and connect your V223w to another Mac... Are you able to do this, do you have access to another system, could even be a PC ( in the worst case )
Ideally, having 2 screens connected to your G5 would be the best situation.
THis way, with one working screen, you can attempt to modify the resolution and refresh rates on the V223w from the good screen, be sure to activate screen mirroring, otherwise you will not have access to the other window of monitors system preferences.
If you can get two monitors connected and mirroring is not an option, then either your monitor is KAPUT or the video card secondary port is KAPUT, try switching the port of the card your displays are connected to. I think they are both DVI ports. If the opposite screen is now working, then you know it's the port on the video card.
Hope this will get you through it.

Posted on Mar 31, 2009

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SOURCE: Grey screen with a blinking folder and question mark

Two possible things are wrong either your hard drive has gone or your system has corrupted. Put your instal disk in start it up holding down the c key. Once it has started check that the hard drive exists by go to the menu bar and selecting the disk utility. If the hard drive shows it means that it is okay run the disk utility check drive and then run the repair permissions. Then try restarting, if it works then you are back up and running again. If the drive shows up and you restart and the same thing shows up with the grey screen, you will need to reinstal your system. You do this by starting up with the instal disk holding down the c key and run the instal script. To keep your hard drive contents your will need to use the preserve users instal.

If your hard drive does not show up the hard drive is probably a gonner and you will have to purchase a new hard drive and instal a fresh system.

Hope this helps

Posted on Mar 23, 2010

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