Exclamation E975 Boot Failure

Hi guys, I have a E975 OG and I now cannot start my phone so I come here to ask for some help. The phone will go into a black screen (The screen is on but it just shows nothing) and wouldn't continue to boot after the LG logo(not the animated one), the phone is perfectly normal when it is off(showing the battery charging icon when connected to power), tried Factory Hard Reset but no use. KDZ software update will get extraction error. Basically the phone can just charge and seems that cannot to my computer. Anyone can help please?