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Yes the TV could have changed your screen settings (probably to 640X480 resolution).
Go to the Control Panel, then click on Display, then the Settings TAB, then change the Screen Resolution to at least 1024X768 pixels or higher to suit your requirements.
NOTE :- The higher the resolution the smaller Icons and text will be displayed also a lower color quality display ie the best is 32 bit color.
You get the audio from PC: you must use a separate audio cable to your TV audio input. Configure your PC Display properties to a lower resolution until you reach a format your tv can display. If you use a flat digital screen check the manual to know the resolution to be used with VGA input. Use Dual screen option or swittch main screen/external/both using FN key + blue key showing screen on your keyboard. (F4 or F7? check manual.)
I think ur laptop audio drivers not suppoted speakers.Better to take drivers from nearest showroom or goto www.acer.com and download the drivers.Install it.After installation ,please restart the laptop and check it.