Why isn't my Lumia 520 connecting to my computer after the Win 10 preview upgrade?

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Windows Central Question

why my lumia 520 not connecting to computer after win 10 preview upgrade

i recently upgraded my lumia 520 to win 10 preview upgrade. after upgrade my phone became very slow and hanged a lot. so i reset my phone. in reset processes it stuck on gears and switched off. i tried many times but it again stucked on gears and switched off. and it also not connecting to my pc with data cable.
what should i do.
 

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