There’s a real design fault with the Lenovo G570 laptop – the hinges become loose because the retaining nuts come away from the case mounts inside the cover. To fix this you will need to dismantle the laptop, drill a 3mm hole from the hinge hole all the way through the case and use M3 bolts and a nut to secure it permanently.
Note: In order for the case to shut properly, you will need to remove the embedded nut from the upper case (easy) and reem out the plastic that held the nut by using a large drill bit (very easy). You’ll know what I mean when you try to put the laptop back together 
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Post time: Jul-14-2017