Hi Jimma,
Your machine does have a switch test in the "Diagnostics" menu, and to access it, use the buttons inside the front door.
What you have described sounds like the top 4 rows of switches are not working (seen this many times), and means that a chip has blown on the CPU board - either 6J or 5J (4011).
When you are in the switch test, you will see am 8x8 matrix of the switches on the display. The top 4 rows will either be permanently on, or permanently off. Check the other stand-up targets you didn't mention in this test and see if they work. If they do, it is definitely a failed chip.
If not, follow Strangeways' advice.
