[Q] Xperia Z2 failed to turn on shows redlight (only when charging) topic

When I connect my xperia z2 to the charger, it shows the red light like its charging then after a couple of minutes shows the sony logo and shows the battery icon then then the red light goes off and sequence continues. The phone is driving me nuts. I've tried using flash tool but the phone cant even get into flashmode, it gets into fastboot mode though but thats about it. I've tried different chargers but failed.