Try to enter your BIOS and on the last page, reset your configuration to default.
F-10 to save and try it.
PS have all external devices disconnected before making these changes.
It looks like you nic card or netwk boot rom is trying to load.
And also, if you do not have a A drive or floppy drive installed, disable it in the BIOS as well.
Remember to save when you exit.
Hope this info has helped you.