Answer to "I think machine has blown fuse"Hi Gemma, Please look into this post: How do I replace the damaged power cord It lists the disassembly instructions for the power cable retraction system - along with replacement. When reviewing your symptom and “possible” cause being “cable-displacement” - THIS REALLY STOOD OUT! I hope it helps some.
Answer to "iPhone SE - Bring it back to life"Hi Luca, I like your phone :) More important - YOU like your phone! Just get this: iPhone SE LCD and Digitizer Its the Digitizer and LCD assembly - you only need the digitizer but this is what I could find. The price is nice too! As for the SE Nano SIM Card Tray: iPhone 5s/SE Nano SIM Card Tray I could not find a possible sollution to the “sleep issue” here on the site but I found some steps for the Iphone “6” that may very well work for your “SE!” Here’s the link to a very similar issue: https://www.igeeksblog.com/iphone-wont-go-into-sleep-mode/
Answer to "Phone completely not responding"Hi CSJ, Sorry you’re having this issue. It turns out that your battery “may” be the issue. I found a post from 2016 that looks very similar to yours. Check it out: Phone wont turn on I hope it helps you. Also Lithium batteries will do strange things if the “sense” circuitry is bypassed. You can either try jumping (MAY EXPLODE! - though never happened to me or mine BUT MAY!) or get a new battery (EASY BREEZY!)