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Cannot switch on my phone. It seems to have frozen
Hi @Auragold, I'm sorry to hear about that. 
To begin with, I would recommend you to try a force restart of your device. You can do this by holding down the power button and the volume up button simultaneously for 2 minutes. If your device react by vibrating three times you should try to power it on again by just pressing the power button.
If that doesn't help, I would recommend you to go to this link: https://support.sonymobile.com/global-en/xperiaxa1/faq/i-cannot-power-on-my-device/ and follow the troubleshooting steps.
Let me know how it went!
The problem is now solved thanks to Sony Support.