Cannot turn on in certain situationsMy iMac was originally a 3TB fusion drive but I removed the HDD and replaced the Apple NVMe blade with an ADATA SX8200...
"iMac 27" 2010 Chime loop and black screen issue"に関する回答@alrazule - I ended up fixing it by baking the GPU and that fixed it for now. A longer term fix will be to replace the GPU but as it’s already 10 years old I’m not sure it’s worth the investment. I did follow along a thread about replacing with a modern GPU so that it can run Catalina but again I’m not sure that’s worth the investment. If you’re interested in this route the thread has a wealth of information: https://forums.macrumors.com/threads/201...-imac-graphics-card-upgrade.1596614/ Good luck with your iMac!