How to enter nocheckCPUIDLimit on ESXi 4.0

1. At the initial bootloader screen (when booting from the ISO), press TAB to edit the boot options
2. add "nocheckCPUIDLimit" right after
   "vmkernel.gz", so that the first part of the boot options BEFORE the
   first "---" reads: "mboot.c32 vmkernel.gz nocheckCPUIDLimit ---"
3. Press enter to finish

When ESX is booting from the HD, press Shift+o and type nocheckCPUIDlimit.