Kernel Extensions in name corresponding to current thread: kernel_task Panic(cpu 0 caller 0xffffff802018d8aa): "UPSB(iMac18,3): thunderbolt power on failed (CPU 0), Frame : Return Address I managed to download and reinstall Big Sur but still having the same issue! I also unplug all attached cables as the system report was saying thunderbolt power issue. Even when the computer isn't even running any software. IMac 2017 Big sur 11.4 ( 20F71) keeps crashing My iMac 2017 has started crashing, kernel panic and keeps crashing very soon after a restart. USB Device: FaceTime HD Camera (Built-in) USB Device: Bluetooth USB Host Controller Serial ATA Device: APPLE HDD ST1000DM003, 1 TB Graphics: kHW_NVidiaGeForceGT755MItem, NVIDIA GeForce GT 755M, spdisplays_pcie_device, 1 GB System model name: iMac14,2 (Mac-27ADBB7B4CEE8E61) Kernel Extensions in process name corresponding to current thread: kernel_taskÄarwin Kernel Version 18.6.0: Thu Apr 25 23:16: root:xnu-4903.261.4~2/RELEASE_X86_64 It usually is very difficult to get it to turn back on, sometimes I have to unplug it and wait for a while and even then it is hit or miss on whether I can get it to boot back up. I will post the crash log and if anyone can figure out a fix, it would be most appreciated. I already reloaded Mojave one of the times it crashed, from one of the boot screens (I think command R). When I try and turn it back on sometimes I get nothing, sometimes the Apple logo, sometimes a circle with a slash. I don't have to be doing anything and it will crash. I have a late 2013 model 27" imac with the newest Mojave OS and it keeps crashing for no apparent reason.
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