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To get to the BIOS screens, the machine must be power cycled.  There are several methods with which this can be achieved, including the Reset button on the Power Control panel on the System tab.  After the power cycle takes effect, the console window will go blank for a while, then show some stuff, go blank again, etc., before finally showing a screen giving some options to enter.  In the case of these machines, the BIOS parameters are eventually accessible by hitting going into Setup mode using the Delete key (or fn-delete on a Mac) during the short time the options are available.  In at least some cases, the machine goes through the boot cycle twice.  Wait too long and the machine boots the OS.

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