My Samsung S5 was showing no glitches at all. It was close to having a flat battery. I turned it off to replace sim but it wouldn't turn back on. Thinking the battery was flat I've connected to a charger. There was no indication that the battery was charging. I've left it charging over night but still nothing - completely dead. I've held the power on - nothing. I've removed the battery and waited a few minutes - nothing. I've removed the battery and held the power button for over a minute - nothing. I've held the power, home and volume buttons - nothng. I've put the original sim back in - nothing. I've checked the battery case is completely clipped on - nothing. H E L P!!