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When you've connected the VGA cables, power on the laptop and monitor and hold the Fn (function)key and F8 it should switch display from LT to Monitor.
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You hold down the Function key and tap F8.
You may have to wait for the POST screen to pass first but not always.
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When you're at the desktop with everything attached and monitor powered on hold Function and press F8 it's a simple process.
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BigJerr, have you checked the inside of the case on the motherboard for any black burn marks,leaking capacitors,any loose hardware, anything thats held together with screws. When you smell the motherboard is there a burn smell?
The thing ive noticed when getting a used computer is the hardware components not fully connected.