When you are stuck on iPhone dead or loop screen, you can use recovery mode to fix this instead of resetting it because reset would erase all data and settings so you may lose your precious data. if you use recovery mode, you don't need to worry about data loss. You also don't need to press home or power button if you use the famous tool used to enter and exit recovery mode called ReiBoot.
It is straightforward, totally free. If needed to try, download it here: [http://www.tenorshare.com/products/reiboot.html|Download ReiBoot].