my mobile was being updated when it was switched off and after that ir did not start again a blank screen apeared after that it said press home to upgrade but its about 2 hours that the mobile has not been turned on

Hi there, abeerfromuae!
Thanks for reaching out to the Apple Support Communities! If I am understanding your issue correctly, your iPhone is not turning on and I’m happy to help! Check out this article with the steps to follow If your iPhone, iPad, or iPod touch won't turn on or is frozen. This article will guide you through the best troubleshooting steps to take, along with the next steps if the issue continues.
Cheers!