If your XPERIA 8 or any other Sony Ericsson phones refuses to power on, here are some likely causes and probable solutions, comment below in case you had issue and it could not be solved
The problem might be caused by a problem either with
the charging cable, the battery or the phone; this may indicate a fault
with the handset itself. However, please verify that the battery is
being properly charged. If the battery does not appear to accept a
charge, check the following:
1. After attaching the charger, the screen and display light up.
After approximately 10 seconds, the light automatically switches off to
optimize charging speed. To activate the light, press any key. In
charging mode when powered down, some phones continue to display
"charging" message after receiving a full charge. To see if a full
charged is reached, turn phone on and check the battery icon.
2. Charger is properly attached to phone with no obstructions (lanyards, cases, etc.)
3. If using a wall charger, make sure charger is plugged into power source and verify wall outlet is working
4. If using a USB cable try inserting the USB cable into a different USB port.
5. Try another USB cable/charger and battery.
If all the above fails the handset will need to be seen by an approved
Sony Mobile service location. Please contact Sony Mobile Customer care
for additional troubleshooting and repair options. Please refer to this
SONY SUPPORT and choose the closest location to you.
