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Buadhai

macrumors 65816
Original poster
Jan 15, 2018
1,126
436
Korat, Thailand
Since my 2017 iMac running Monterey has caught the kernel panic disease I'd like to check the RAM. It was suggested elsewhere that I try MemTest86. I followed the installation and boot instructions here: Creating A MemTest86 Bootable Drive..., but I can't get the USB drive to boot. I tried three different USB drives: a spinning drive and two thumb drives. dd seems to write to the drive just fine, with no error messages, but when I boot holding down the Option key, only two bootable drives are displayed: the internal SSD and an external bootable USB clone. The MemTest86 USB drive never shows up.

What have I done wrong?
 
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