Poor Experia SP

[Pizaman]

I've searched and not found! My Xperia SP. Is in trouble. Here are some symptoms.
1. If I simply push and release the power button, it flashes green and nothing happens.
2. If I hold in the power button, the green light comes on for 10 seconds followed by the red light and the Sony symbol on the screen for about a minute. Then it shuts off.
3. If I plug in and hold the powers button in (wall or laptop) the same as # 2 happens, but it continually loops over and over again.
4. Laptop does not recognize when I plug it in so I can't charge or repair

I have pressed the yellow power button in the back and had it vibrate 3 times, but it does not turn on.

[Phy]

Try contacting Sony Xperia Support.
http://support.sonymobile.com/global-en/contactUs/

[Thommo]

Try performing a system repair using Pc Companion as this will often fix issues - This will factory reset your phone

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the onscreen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP

[Pizaman]

This starts to perform the repair, but my phone does't stay connected to my computer long enough. I then get an error message indicating that the update could not be completed because of connectivity.

[Phy]

In that case, contact your local Xperia support.