What's happening there with those PXE errors, lexlap, is that you have Network Boot in your boot order [beneath your HDD and other options]. The Intel chipset has determined that there was no boot device [you removed the hdd] before it and that there is no actual network boot server available, so it pops those messages and shuts down. No problem.
Typically, you would use network booting if you plug your lappy into a corporate network; booting would be automatic, upon demand.
jingda commented: + +10