watch screen is blank
watch comes on intermittently
Apple Watch Series 5, watchOS 7
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It may be a hardware problem. For repair & service:
watch Repair - Official Apple Support
watch Service Pricing - Apple Support
You can try these steps:
The first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:
How to restart your Apple Watch - Apple Support
Restart your iPhone - Apple Support
If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup just created. This should result in no loss of data. It deletes all temp and corrupted files and re-indexes the file system.
Unpair and erase your Apple Watch - Apple Support
Set up your Apple Watch - Apple Support
If your Apple Watch won't charge or it won't turn on - Apple Support
If you still need help, contact Apple Support.