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The X1 box acts like a set-top cable box. The HDMI output can be connected to any HDMI connector. There are three HDMI connections on the rear of the set. You have the Blu-Ray connected to one of them, Input 6. You should have no issues with connecting the X1 to either Input 7 or Input 8. There is no specific "TV" HDMI connection. You simply use the remote to select the HDMI port that the X1 is connected to.
This happens when you are connecting with a coaxial cable. If possible you will need to connect your set top box to the television with a composite/RCA cable and watch tv on input 2 instead of on input tv.
As soon as TV detects signal on input 1, 2 or 3 it will make an input selectable. Supply signal first then select an INPUT. In other words, something has to be hooked up to those inputs before you can select them.
If your using a HD converter box, there is usually a blink when switching from an HD channel to a non HD channel. It is just adjusting from different pictures modes such as changing from a 480i channel/show to a 1080i channel. If this is the case, its perfectly normal.
There are two possible problems:
1. You are connecting a 15-pin (on the laptop) to the 9-pin (on the TV) connection. This isn't the video-in connection for the TV. The TV has a DB-15 connection near its DVI input connector. You should be using a 15-pin to 15-pin cable. The DB-9 connector on the TV is a serial port for servicing the TV.
2. You aren't enabling the external video port for the laptop. Try hitting Fn+F5 on the laptop to cycle between the three display modes: laptop only, laptop + TV, TV only. Make sure to wait a few seconds after hitting Fn+F5 to let the displays sync up.