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, <[email protected]> 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, "[email protected]" 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. > -- 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.
