Is this something that changed recently? What it is trying to do is boot from the network (hence the DHCP message, its trying to get an IP address and find a server to boot from). Typically, a network boot option is one of the last attempts a PC will make in order to boot. It should be trying to boot from removable media (USB, Floppy, CD) first, then any hard drives, then the network.
Not trying to scare you, but you may have some kind of hardware failure happening if this just started to occur. You may either just have a cable going bad or worse, a bad hard drive. Anything happen recently (power outage, etc?)
Ignore my statement about failing hardware. I was just re-reading everything this morning and realized that you could boot, just that it was trying to boot from the network before the hard drive. Definitely change the boot order so that the hard drive boots before the network. Still curious how this got changed.
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