DJI Phantom 3 Standard Motor/ESC Issue

I receive this Phantom 3 standard which has a motor issue which is not spinning up as normal, so i want to show you guys/girls how i go about resolving this :)
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DJI OSMO Z Axis £110 from goo.gl/gs6aQT
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Osmo - Base £7 goo.gl/ViTdPf
Osmo - Extension Rod £43 goo.gl/kkqK2l
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Drone Pilot Hi Viz Reflective Safety Vest (was £24.99) now £19.99 goo.gl/ckMSoo
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Equipment I use and recommend
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DJI Phantom 3 Standard goo.gl/PJPdLY
DJI Osmo goo.gl/gBtdS7