Several problems can prevent your Apple Watch from starting up. An unexpected blackout need not spell doom. Even if you have already tried charging your Apple Watch overnight, most problems have a simple solution.
Force-Restarting Your Apple Watch Will Cause It to Activate.

The most common cause of an unresponsive Apple Watch with a black screen is a dead battery. The first line of defense against a malfunctioning Apple Watch is a cold reboot unless you’ve been using it constantly throughout the day and the battery has run out. If the watch charging time isn’t the issue, you don’t want to wait for it to finish.
It’s possible that a software glitch caused the Apple Watch to turn off, or that you mistakenly activated a setting that did so. When you do a hard reset, the device turns off by itself. Almost any issue with the Apple Watch is remedied simply by turning it on, with the exception of a completely dead battery.
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Apple Watch Charging
In spite of what you may believe, your watch is not charging simply because you think it is. When the day is through, if your Apple Watch automatically shuts off, the battery may be dying. It’s possible that your Apple Watch isn’t getting a full charge while you sleep, which could explain why it acts strangely in the morning or afternoon.
If there is still plastic wrap clinging to the bottom of your Apple Watch, remove it. The Apple Watch charges wirelessly via induction as it rests on the charging mat. It’s important to remove anything you find stuck to the underside of your watch.
Check sure the power adapter is inserted into the charging station. It’s simple to forget to re-plug in the charging station after someone has unplugged it to use the nearby wall socket.
Verify that there are no breaks, worn areas, or other damage to the cable. If there is another Apple Watch in the house, use it to verify that the charging dock is receiving electricity. While the watch is charging, the power icon (a lightning bolt) should appear on the screen.
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Verify the Apple Watch Configurations
Screen Curtain, an accessibility feature built into Apple Watches, also allows the display to be hidden. The visually handicapped can receive additional support using this function included in the VoiceOver application. When VoiceOver is activated, the watch is controlled entirely by sound.
In the event that turning off VoiceOver in the Apple Watch’s settings solves the problem after a hard reboot, charging the phone, and checking the charging dock have all failed. Put away your wristwatch, you won’t need it.
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Shun the idea of using the power reserve mode

The Power Reserve mode on Apple Watch is quite similar to the low power mode on the iPhone, but it’s even more extreme. In Power Reserve mode, nearly all Apple Watch capabilities are disabled, and the screen turns off. The time is displayed for a split second when the crown is pressed, and then the watch returns to darkness.
To exit Power Reserve mode, you must restart the watch. When the Apple logo appears, release the side button (not the crown) and repeat. If it doesn’t work, you can conduct a hard reset by holding down the crown and the side button at the same time.
How can PowerReserve be switched on? It alerts you when your Apple Watch’s battery drops to 10 percent. With this display, it’s simple to inadvertently activate the power saver. A second method of activating Power Reserve is by tapping the battery icon in the Apple Watch’s Control Center and then tapping Power Reserve at the bottom of the subsequent screen.