FWIW when installing OpenIndiana I had to set ACPI to On in boot menu option #5 then enable ChainLoad disk 1. Details here: https://github.com/jdrch/Hardware/wiki/How-to-Install-OpenIndiana
Here's the original Illumos thread in which I posted my problem: https://illumos.topicbox.com/groups/discuss/Ta2ad287becc35dc1/help-booting-openindiana-live-usb-on-dell-optiplex-390 ------------------------------------------ illumos: illumos-discuss Permalink: https://illumos.topicbox.com/groups/discuss/T174b2e1d080b74f2-Mc690518f28702f27d02d836b Delivery options: https://illumos.topicbox.com/groups/discuss/subscription
