Yeah, that means it can't find a bootable C-Drive, so it's trying the network-boot (not normal). Access the BIOS and make sure Boot entry #1 is still set to "Windows Boot Manager". If that is OK, try running ePSA Diagnostics (outside of Windows).  
Every time I turn on my PC, I have to sit through about a 5-minute black screen saying: " >>Checking Media Presence...... >>Media Present...... >> Start PXE over IPv4 on MAC: (then the address) Press ESC key to abort PXE boot . " (80% sure this is a problem with the hard drive) I am fairly new to the gaming PC world, and this desktop is only a couple months old. My very limited knowledge of PCs has my brain strapped for finding a solution. There has to be a very easy fix for this. 
PC won't Power on/boot up properly