Some boards have strange messages when there is no system drive. Verify that the cable to the HDD-SSD is firmly seated. If that does not help, use a different cable and/or a different port on the board. Also, disconnect the cables to the CD-DVD drive and boot again to see if it has malfunctioned.
The Preboot Execution Environment (PXE) comes up when the system is trying to boot from network, this can happen when the system has a defective hard drive or no operating system installed.
In this case I would recommend following the steps paramountain mention above, if not try to test your system with different hard drive.