A timeout was set for the default PXE boot option and is prompting to "Press [F8] to Select a boot option".
However, the prompt is garbled/unreadable and the countdown timer doesn't match what is set in the PXE configurator sometimes showing a countdown of 20-30 seconds.
GSS 3.x
The issue is related to having enabled MTFTP under the "Multicast" menu in the PXE configuration utility. If this option is checked but the user's environment isn't set up properly for MTFTP, the issue described in this article may be seen.
Remove/uncheck the option for MTFTP under "Multicast" tab in PXE Configuration Utility and save changes as shown here: