Daniel kindly provided this list in the NewsGroups. It may help others in finding the right key combination to get the Boot Menu.
Please note that these aren't the keys intended to enter CMOS Setup, these are only the "Boot Menu" keys!
ENTER key
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Some LENOVO desktops use this key to interrupt the boot sequence and allow you to select the boot menu
ESC key
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Works with most modern ASUS laptops, most modern HP laptops, and also with many SAMSUNG laptops
F8 key
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Used for most ASUS desktop mainboards, and also for some modern PACKARD BELL desktops
F9 key
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Used for most HP desktops and COMPAQ desktops
F11 key
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Used for most AsRock desktop mainboards, most MSI desktop mainboards, and also for many SONY laptops
F12 key
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Valid for many ACER laptops, AOPEN laptops, DELL laptops, DELL desktops, FUJITSU laptops, GIGABYTE desktop mainboards and TOSHIBA laptops
"PIN" method
------------
Most modern LENOVO laptops no longer use a key. You have to turn off the computer and then wake it by introducing a pin into a small hole in the side of the computer. That will show the bios boot menu.
Please note that these aren't the keys intended to enter CMOS Setup, these are only the "Boot Menu" keys!
ENTER key
---------
Some LENOVO desktops use this key to interrupt the boot sequence and allow you to select the boot menu
ESC key
-------
Works with most modern ASUS laptops, most modern HP laptops, and also with many SAMSUNG laptops
F8 key
------
Used for most ASUS desktop mainboards, and also for some modern PACKARD BELL desktops
F9 key
------
Used for most HP desktops and COMPAQ desktops
F11 key
-------
Used for most AsRock desktop mainboards, most MSI desktop mainboards, and also for many SONY laptops
F12 key
-------
Valid for many ACER laptops, AOPEN laptops, DELL laptops, DELL desktops, FUJITSU laptops, GIGABYTE desktop mainboards and TOSHIBA laptops
"PIN" method
------------
Most modern LENOVO laptops no longer use a key. You have to turn off the computer and then wake it by introducing a pin into a small hole in the side of the computer. That will show the bios boot menu.