I recall a similar issue I had and I merely replaced the RAM sticks. Also maxed out the RAM while I was at it. Problem solved.
On Tue, Mar 27, 2018 at 6:11 PM, <fishjoy...@gmail.com> wrote: > 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, "fishj...@gmail.com" 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 imaclist@googlegroups.com > To leave this group, send email to imaclist+unsubscr...@googlegroups.com > 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 imaclist+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- 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 imaclist@googlegroups.com To leave this group, send email to imaclist+unsubscr...@googlegroups.com 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 imaclist+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
