unable to power on

If you already tried (to no avail) all the steps provided in the support article that led you here, and/or the ones provided in this other article:--> If your iPhone or iPod touch won't charge , it could be a hardware (battery? screen? other internal component?) failure but we, just users like you, cannot diagnose that issue remotely, sorry.

I suggest that you make an appointment (*) and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> https://locate.apple.com/choose-country-region . After checking it out, they'll give you all the available options.

Regards

Giulio

(*) You can do it:

• Online:--> Genius Bar Reservation and Apple Support Options - Apple;
• Contacting a local Apple Store or AASP among the list provided above;
• Using the "Apple Store" app, available and downloadable from AppStore.

If your iPhone won't turn on or is frozen, try the things outlined in this support article --> If your iPhone won't turn on or is frozen - Apple Support

Sections about...

- If your screen is black or frozen

- If your device turns on but gets stuck during start up, try to update it.

- If your device still won't turn on or start up, contact Apple Support at https://getsupport.apple.com/?caller=kbase

Of course it not charging could explain why it does not turn on. Read what to do if your iPhone or iPod touch won't charge --> If your iPhone or iPod touch won't charge - Apple Support

If necessary, take it to Apple. Go to this page to find your nearest Apple Authorized Service Provider (AASP) or Apple Authorized Distributor (AAD) --> Find Locations

How to make a Genius Bar appointment

1. Go to Genius Bar Reservation and Apple Support Options - Apple

2. Go to "Get hardware help".

3. Select your hardware and continue selecting options requiring replacing parts until you see "Bring in for Repair"

4. Sign in with your Apple ID