SYSLINUX 3.86 EBIOS
This issue occurs when a stuck key is pressed during the boot process. If the Shift or Alt keys are pressed during the ESXi boot sequence or if Caps Lock or Scroll Lock is enabled, it pauses at the SYSLINUX prompt. This behavior is by design, but can occur unexpectedly if there is a problem with a keyboard/KVM/remote KVM that is connected to the host. Please refer to the specific hardware vendor of the KVM/keyboard.