>Have you plugged in a monitor to the video out port?
If you refer to the service manual it will tell you how to get into the test mode using a USB keyboard, from there you can access a lot of test information.
No.It's the way to enter I/O center test mode.
Normally you will enter Maintenance mode using PRC.
If the PRC or media center is broken, take that way.
Service manual and maintenance hand book are required for tuner.