Xperia Z3 doesnt boot up

[RCV]

Battery drained out while my kid was watching videos , i put the phone for charging , i see a red ligh bliking and the chagring screen goes off every 10 seconds , i tried volume and power button it vibrates thrice and goes into same stage . I had phone plugged into charger for more than 4 hours its still the same. any thoughts ?

[RCV]

To add further my phone is detected too by PC companion , i tried all options available online nothing seem to work

[MarlonUk1]

if the phone is detected by PCC . have you tried using software repair?

it is usually bad to have your device battery drained.

[RCV]

I am sorry i think there was a typo , my phone is not deteced by PCC