There are to many variables to say for certain that this died or that died. While there are software monitors for temperature and fan speed, etc. only a checkup by a qualified tech can tell you for certain what has died. Your widget has shown you that a
CPU is not working. The Device Manager has verified that only one
CPU is being seen by the computer system.
In my opinion, you have two choices. One, replace the
CPU. Two, take the computer into a certified tech. If it is the
CPU that died, you can not be sure rather it died on its own or something else in the computer (such as the power supply or the
CPU might have overheated) caused the
CPU to die. If something else caused the
CPU to die, then just replacing the
CPU might cause it to die again. That is why I suggest you have a tech check out the computer.
Good Luck...