Thanks for the idea. However, this one (a 24" also) will not boot into Safe mode. In fact, I cannot get even a startup chime unless I pull one of the RAM cards out. It doesn't matter whether the left one is in or the right one is in, if I only have one RAM card in, it will produce the startup chime. However, I still have a black screen.
I did try to set up an appointment at an Apple store, but since it is 10 years old, they would not look at it. A couple of questions: - If it is the video card, does the RAM card thing make any sense? - If the video card was going out, should the Apple Hardware Test have told me that when I ran it last week? - Is there any way to be certain that the problem is the video card? Thanks! On Tuesday, March 27, 2018 at 8:11:50 AM UTC-6, ValterV wrote: > > Il giorno 27/03/18 03:17, "[email protected] <javascript:>" ha scritto: > > > The machine worked fine for about a week, but today when I tried to wake > > it, I got a black and white checked screen. > Bummer. That screen makes me think about a damaged video card. > > I had a similar issue with an Early 2008 24" iMac: red vertical stripes > appeared all over the screen (bad video card), and the iMac froze on > startup. > > When I tried to boot in Safe mode, though (hold Shift key during startup), > it did boot up. So I thought the video drivers were conflicting with the > (now) bad video card, hence the freeze at boot. > I disabled all of the drivers, and the iMac would boot fine (although > screen > redraw was sometimes slow). > > You can try booting in Safe mode and, if working, you may try my > workaround. > > Here's what I did: > - Remove all AMD/ATI kexts in /System/Library/Extensions > (it depends on your video card maker and model; mine was ATI Radeon 2600) > - Terminal: Touch "System/Library/Extensions" > - Delete "System/Library/Caches/com.apple.kext.caches" (in Finder) > - Reboot > > I wrote more details here: > http://www.mac-forums.com/apple-desktops/341784-imac-vertical-lines-screen-f > > rezees-boot.html#post1762659 > <http://www.mac-forums.com/apple-desktops/341784-imac-vertical-lines-screen-frezees-boot.html#post1762659> > > > > > -- You received this message because you are a member of the iMac Group, a group for those using Apple iMacs and eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/imaclist --- You received this message because you are subscribed to the Google Groups "iMac Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
