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Fault with main board. Damaged component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Is there a HMDI output on your Laptop or a VGA output. Some TV's have a DSUB input source that allows VGA depends on your laptop it could be HDMI if so TV should have an extraz HDMI input on the back and you change the source input on the TV to the HDMI 2 or HDMI 3 source depending on where you plugged in the P.C. . If HDMI you need to buy a HDMI cable.
What video "input" sockets are on the side/back of your TV -- HMDI? S-Video? VGA ? Composite? Component? Coaxial?
What video "outputs" does your computer have -- HDMI? S-Video? VGA? Composite? Component? Coaxial?
Have you considered using a Google "ChromeCast" device -- it connects to a HDMI-input on your TV, and software on your PC wirelessly transmits the video signals from your computer to your wireless router to the wireless-receiver inside the ChromeCast ?
To do that you would connect one end of a HDMI cable to one of the HDMI inputs on the TV and the other end of the HDMI cable to the HDMI OUT on the Kenwood. Of course there are other considerations to make the whole process work successfully such as making audio adjustments on the Kenwood and selecting the proper input on the TV. Also having a source (video/audio) input on the Kenwood.
However. I´m inclined to think that you did change the input on your TV. So your problem is another, this is what you have to to to reset:
1. Unplug the HDMI cable from both the TV and PS3. 2. Plug in the AV MULTI OUT cable (the red, white, yellow one provided along with the system) to both your PS3 and TV. 3. Set the TV input to the correct one and turn it on. 4. turn on the PS3 with the front button but DON´T release it, keep your finger on it, until you hear a second beep, thats when you release the button, the PS3 will start to identify what it´s connected to and will display it on your TV.