My M2 dual ( D2302 ) 4.4.4 not charging

Hi ppl my friend has M2 dual D2302 still on KK rom he forgot to charge it now while it's powered on no light no signal for charging but when i turned off & connecting the usb charge the light turn on red & the signal of charging show up but nothing charging also pc cannot red the phone plz any help

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Rooting Xperia M2 Dual D2302

Please do let know - I am unable to root Xperia M2 Dual D2302 after unlocking bootloader - Thanks