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Go to the device manager (through the control panel) and uninstall the drivers. Get new drivers through Sony Vaio support and see if this resolves the issue.
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What exactly is it doing or not doing? Does it show up in device manager? Does the video just not display when you try to turn it on? A simple"it doesn't work" makes it hard to diagnose...
Every motherboard that runs a computer has a backup battery to run the circuit while turned off. This battery runs the real-time clock (RTC) and is referred to as the CMOS battery. By keeping the clock active and running even when the computer is switched off, power up/down cycles can be logged and before the internet, your computer could keep dates accurately. It also serves to maintain the system configuration settings in BIOS memory based on RAM or FLASH RAM.
It should be located somewhere on the motherboard wich means pulling the computer completely apart which unless you know what you are doing may be a little difficult for some, but not inpossible.
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