Z3 dead after trying to update

Question

I tried updating my Z3 this afternoon, downloaded the PC companion and the update. I connected my phone as instructed and it started to update. PC companion came up with a notification that there was no internet connection, although there was as web pages were loading normally. I clicked retry on the pop up box, but to no avail. The PC companion restarted and ever since my phone will load the initial Sony Xperia black page on start up and stop there. 
The phone won't let me turn it off using just the power button, I need to hold both the power button and volume up to get it to power down. When the Sony screen is showing, PC companion wont detect the phone, saying no phone/tablet connected. When I turn the phone off using the power + vol up buttons, PC companion then recognises the phone, I try to go into phone software update, a screen pops up instructing how to connect, I press ok and the screen doesnt go away, when I press cancel it takes me back to the PC companion selection screen. After a minute of the phone being powered down and still connected to the USB port, the phone turns itself on, displaying the Sony Xperia black start screen and stays there. PC companion then doesn't recognise the phone.  
Please help, its driving me mad
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Answer 1

@Bennyfromtheblock, to me it sounds like you connect the phone to early. When you are going to perform a software repair you should not have the phone connected until PC Companion tells you how to connect it.
Do the following: Force a shutdown of your unit (ON/OFF + volume up(+) for 5-10 seconds) > Without connecting the phone, press "Start" on Support Zone > Press "Start" on Phone / Tablet Software Update > Now you'll get a message that says "Could not find phone / tablet" > In this message you should press the blue clickable link "repair my phone / tablet" > You will now start a step-by-step guide that takes your through the repair and this guide will also tell you when and how to connect the phone.
@Tanke_MD, do you have an internet connection all the time when you try to repair or update the phone? You need to have an internet connection through the whole update/repair process. If you do, are you using any Proxy or similar for your connection? Or perhaps you have a firewall/antivirus that is blocking PC Companion.
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