Did the CMOS battery die? It may be causing the BIOS to not remember anything.
My Brother's laptop will not boot with a dead CMOS battery.
To fix the Media Test Failure Cable try this:http://www.computerhope.com/issues/ch000706.htm
To fix the Exiting PXE ROm try this:https://answers.yahoo.com/question/index?qid=20110617021942AAnNING
In the BIOS, look in the boot options and take the "other devices" or "other" out of the boot sequence.
Also, check to see if boot from LAN is enabled. If it is, disable it.
PXE is a protocol that will enable you to boot from a network drive or server.
When it says that it failed, it is because it could not find an OS on the network.