My iphone 5 won't turn on but when plugged into power source it keeps showing apple logo?

My iPhone 5 won't turn on at all and then when I plug it into a power source either into a plug socket or into my laptop with the USB cable it keeps showing start up screen with apple logo over and over again on a loop.
I have tried holding the top and front button together, this didn't work. I have also tried connecting to my laptop and following the reboot steps that I found on another discussion forum. Neither worked for me. The phone just won't reboot and it keeps continuing to loop the apple logo screen over and over without me touching anything.
The iPhone won't even connect to itunes and so itunes seems to not recognise my phone because its not even turning on (just continually apple logo screen appears for 5 seconds, goes to black screen and then repeats).
I don't know what is happening to it! Can anyone help? Is it a fault with the hardware or have I dont something to it? The next appointment at the genius bar for me is monday so I'm going to keep looking for any more recent ones until then but I really need to get it sorted before then so if anyone can help that would be great!
Thanks

Try a reset when your iPhone is plugged into the charger as you say it does not respond when not plugged in...
Press and hold the Home and On/Off buttons simultaneously until you see the Apple logo, then release.  This may take up to 10 seconds.  This is the equivalent of a re-boot and you will not lose any data.
See if it will charge after this.

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