iphone 11 wont start up no matter what i do

Hi markobucko

Welcome to the Apple Community.

Wondering which iOS version is installed on your iPhone 11,

and

what you were doing when the iPhone became unresponsive, (eg. using an app / not in use / updating / etc.)

and

what you have tried, (restart, force restart, etc.)

and

if there were any error messages (update failed, locked because too many wrong passwords, activation lock, etc)

and

what the screen looks like now (blank , apple logo, apple logo with progress bar etc)

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If you haven't tried:

How to: Restart your iPhone – Apple Support

How to: Force restart iPhone – Apple Support

or

Perhaps this article from Apple Support may help:

If your iPhone won't turn on or is frozen - Apple Support

________________________________________________

If needed:

There is a "Get Support" link to Apple at top right on this discussion page.

or

Apple phone numbers around the 

Contact Apple for support and service - Apple Support

All the best :-)

Thank you for your reply, markobucko.

So, if the storage was full, it urgently needed a backing up of the data to a computer, and deleting of some files.

If more items were added, the iPhone likely does not have enough memory / storage space in which to operate.

Sorry I do not know what is needed / possible in this unusual situation.

or whether the data on the iPhone could still be accessed from a computer, to ease the storage / memory load.

If the matter is complicated by the battery not charging, that could still be the main cause:

Battery replacement estimates (more like US$70 for iPhone11) can be obtained from the page below.

iPhone Battery Repair & Replacement - Apple Support

If this is not how you received that quote already:

It would seem best to take the iPhone to an Apple Store for a proper evaluation.

They will generally look into the matter, and give advice, or an estimate if work is necessary.

A "Genius Bar" reservation is recommended:

Genius Bar Reservation and Apple Support Options - Apple

If you want to check if the iPhone has any warranty / Care coverage

You could enter it's serial number:

Check Your Service and Support Coverage - Apple Support

Apple doesn't give a repair amount before examining the device unless it is physically damaged.

In the mean time:

If your iPhone won't turn on or is frozen - Apple Support