The HDMI inputs on your Aquos high-definition television set are designed to be connected to devices such as gaming systems (either the PlayStation 3 or the Xbox 360) and Blu-ray players. However, if you have one of these devices connected to the TV and the Aquos doesn't appear to be displaying content properly, you may have an issue with the settings of the devices or the actual cables themselves.
Unplug any component video cables that you have plugged into the back of your Aquos high-definition television set. Certain Aquos models will automatically disable the HDMI inputs on the TV, if the component inputs are in use. Just having cables plugged into the component inputs, regardless of whether the device is on or not, constitutes "in use" and will disable the HDMI. Unplug the cables and try to use your HDMI device again.
Check the settings for your externally-connected devices and make sure that any "Video Output Settings" are set to HDMI. Certain devices such as Blu-ray players allow you to specifically choose what type of cable you're using and the device will output video accordingly. If you are using an HDMI cable to connect the device to your Aquos TV, but the Blu-ray player thinks you are using component cables, this could cause image reproduction issues.
Check the manual that came with your Aquos TV to make sure your specific set is capable of receiving both audio and video over a single HDMI cable. Just because every HDMI cable is capable of transmitting both types of signals doesn't mean the TV can do so. Certain older Aquos sets only receive video over the HDMI cable. This means that you either need to use a separate HDMI cable to receive audio or an optical audio cable.
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