Please don't press the screen back into place or try to glue it yourself yet. The cause matters because this could be a simple adhesive failure, but it can also happen when the battery swells beneath the display.
What you should do now
- Inspect the gap without pushing the screen. Check whether the separation is limited to one edge or whether the display is bulging outward.
- Check for signs of battery swelling. A raised trackpad, a bulging bottom cover, increasing screen separation, unusual heat, or a chemical smell are warning signs.
- Avoid pressure and twisting. Don't use clamps, tape that pulls on the display, a hair dryer, or household glue.
- If you suspect battery swelling, shut down the laptop, unplug the charger, and stop using or charging it. Arrange professional service promptly.
If you see any of them, stop charging and using it, and don’t press the screen back down. Keep it away from heat and flammable surfaces. Don’t use glue, tape or a heat gun to fix it, because puncturing or heating a swollen cell can cause a fire. Bring it to a service centre, and if you can’t go straight away, store it powered off on a hard, non-flammable surface.
If the device is under warranty, or you bought a protection plan such as Microsoft Complete, this is a hardware defect and the right route is a Microsoft service request, not a third-party repair. Keep your purchase proof and photos of the gap.