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Issues with lines across the screen, as well as freezing

2617 Views 14 Replies Latest reply: Oct 21, 2008 9:22 AM by Chris Blackwell1 RSS
rainerrohde Calculating status...
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Jul 17, 2008 2:30 PM
Issues with lines across the screen, as well as freezing

Hello all

Got an iMac since January 2008 and I do like it a lot, even though it has some issues:

-- It displays (quite often) lines partially across the screen
-- Lines appear as well when opening applications or when menus come up
-- The system freezes more than I like to admit (more than my Windows/Ubuntu box)

I don't know if the freezing has to do with the lines that are shown on my screen. But I assume that both issues relate to some video card problem. I can't be sure - but that's what I assume from living with this issue day to day.

The line on the desktop (most of the time it is there before login) I can always get rid of by changing the display resolution to something else and then changing it back. Normally the line is gone, or, reappears on a different spot on the desktop. But repeating the procedure removes the line.

However, this does not mean that the lines are not showing up again when launching apps or displaying menus!

And since those lines appear to happen randomly, I think it's safe to assume that we're not talking dead pixels here, either...

About the freezing:
My iMac freezes sometimes when I move the mouse around, when switching desktops using "spaces" or when the zoom function of the Dock kicks in. Sometimes the screen goes completely black, sometimes completely white. The mouse, however, always works. But the system requires a reboot.

Again, this happens too often to feel comfy about it.

With my little knowledge of Mac troubleshooting I assume that there's something wrong with the ATI card that's built into my Mac. On the other hand, some people say that they started getting similar issues after updating their OS to Leopard. Again other people say that such issues stem from an ATI revision that is too old and the Mac should get a new ATI card. And how would that work? Isn't that an "all-in-one" machine with everything soldered onto the mainboard?

So, any help in this matter is greatly appreciated...

iMac Intel Core 2 Duo 2.8 GHz, Mac OS X (10.5.4), OS/X 10.5.4, Boot ROM Version: M71.007A.B03


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