Easily force PXE boot in Linux without IPMI

Sometimes I need to PXE boot a box for reinstall and don't have easy access to the BMC. Sometimes I don't want to try to race the BIOS prompt for PXE booting. What can I say, I have a short attention span, er, other things to do while the BIOS posts.

One option I could use is ipmitool, but I like to just overwrite the MBR with dd.

Here's the command I use:

dd if=/dev/zero of=/dev/sda bs=512 count=1