cant find my phone in computer to restore and reboot phone

Turn the phone off before connecting to the computer and hold down the Volume Down button while connecting to the computer and keep holding it until you see the recovery mode screen. More information in If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support

its says support.apple.com/iphone/restore

hey my iphone 11 is stuck on the apple logo and it keeps on blinking on and off