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Apple Computing Products:
macOS - Desktop Hardware
Possible GPU failure
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<blockquote data-quote="peacockharris" data-source="post: 1919239" data-attributes="member: 415058"><p>So a bit of a weird one. My late 2013 iMac has been slowing down the last few weeks, so I've been expecting something to fail. Last night I woke it from sleep only to get a blank screen entirely unresponsive. I had to manually turn it off and when I then tried to boot it, I was met with the usual apple loading bar, but with green pixel glitches in it. Sometimes the green was on one end of the loading bar, other times it was all over the screen. I didn't take photos of all variations but below is an example.</p><p><a href="https://photos.app.goo.gl/RSmirk1H9ZEefVxn7" target="_blank">New item by Rhodri Harris</a></p><p></p><p>It also didn't boot. Just froze and sometimes crashed back to the start again.</p><p></p><p>Long story short, I tried everything to get it to boot (safe mode, recovery mode, nothing worked) I tried booting into a disk image of an osx install so I could run disk utility but it didn't show up as an option in the boot menu (holding down alt/option)</p><p></p><p>Then suddenly it booted without me having actually changed anything. It took ages, but I was finally back in. But performing any action at all, whether it's opening a program, switching window, or even moving the mouse a bit too quickly, risks the screen going crazy with RGB pixel glitches. Initially my mouse pointer remains with everything else frozen, but in a few moments the mouse pointer freezes too, with the computer either crashing and restarting, or needing to be manually turned off.</p><p></p><p>Example of this below:</p><p><a href="https://photos.app.goo.gl/ts1EvdbxLjTXF1Lx8" target="_blank">New video by Rhodri Harris</a></p><p></p><p>Tried running diagnostics (D key on boot) but it finds no issues.</p><p></p><p>This strikes me as a possible GPU issue, but am just wondering if anyone has any other ideas. Also would like to know if it's worth fixing/replacing or if I should just look for a new computer.</p><p></p><p>Appreciate any insight you can give!</p><p></p><p>Edit: Also, I already did the steps to reset NVRAM and SMC at boot.</p></blockquote><p></p>
[QUOTE="peacockharris, post: 1919239, member: 415058"] So a bit of a weird one. My late 2013 iMac has been slowing down the last few weeks, so I've been expecting something to fail. Last night I woke it from sleep only to get a blank screen entirely unresponsive. I had to manually turn it off and when I then tried to boot it, I was met with the usual apple loading bar, but with green pixel glitches in it. Sometimes the green was on one end of the loading bar, other times it was all over the screen. I didn't take photos of all variations but below is an example. [URL='https://photos.app.goo.gl/RSmirk1H9ZEefVxn7']New item by Rhodri Harris[/URL] It also didn't boot. Just froze and sometimes crashed back to the start again. Long story short, I tried everything to get it to boot (safe mode, recovery mode, nothing worked) I tried booting into a disk image of an osx install so I could run disk utility but it didn't show up as an option in the boot menu (holding down alt/option) Then suddenly it booted without me having actually changed anything. It took ages, but I was finally back in. But performing any action at all, whether it's opening a program, switching window, or even moving the mouse a bit too quickly, risks the screen going crazy with RGB pixel glitches. Initially my mouse pointer remains with everything else frozen, but in a few moments the mouse pointer freezes too, with the computer either crashing and restarting, or needing to be manually turned off. Example of this below: [URL='https://photos.app.goo.gl/ts1EvdbxLjTXF1Lx8']New video by Rhodri Harris[/URL] Tried running diagnostics (D key on boot) but it finds no issues. This strikes me as a possible GPU issue, but am just wondering if anyone has any other ideas. Also would like to know if it's worth fixing/replacing or if I should just look for a new computer. Appreciate any insight you can give! Edit: Also, I already did the steps to reset NVRAM and SMC at boot. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
Possible GPU failure
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