Sign in iCloud new device

Beyond stating that you appear to be unable to access iCloud, you might start with providing a clear explanation of your subsequent issue. Information as to your iPad model and installed version of iPadOS might also be useful.

Your coded statement "how can I restart w touch power nothing happens" conveys little.

In absence of useful information, if your iPad appears to be unresponsive, connect the iPad to its Power Adapter and allow the iPad to charge. Then, while still connected to external power, try a forced-restart:

Force restart iPad (models with Face ID or with Touch ID in the top button)

If your iPad doesn’t have the Home button, do the following:

1. Press and quickly release the volume button nearest to the top button.
2. Press and quickly release the volume button farthest from the top button.
3. Press and hold the top button.
4. When the Apple logo appears, release the top button.

Force restart iPad (models with the Home button)

Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.

If iPad still doesn’t turn on, or if it gets stuck during start up, see the Apple Support article If your iPhone, iPad, or iPod touch won’t turn on or is frozen. Or, if your iPad isn’t working correctly after you restart it, see the iPad Support website.

If you continue to experience difficulties, you might be well advised to seek assistance directly from Apple Support. You can contact the Support Team using the Support link at top-right or bottom-left of this page. Alternatively, you can initiate and manage your support cases from Apple devices using the excellent Apple Support App. If not already installed, the App can be downloaded from the App Store:

https://apps.apple.com/app/apple-support/id1130498044

You might also visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) where the technicians will be able to assist with troubleshooting - and if needed, perform hands-on test and assessment of your iPad:

Genius Bar Reservation and Apple Support Options - Apple