lumia 800 wont charge or turn on, just vibrates every 20 seconds.

[Windows Central Question]

as above, wont turn on just vibrates.

 

[Summer_Moon]

When was the last time you charged it?

If the battery was severely depleted it can take a good 2-3 hours of the vibrating before it actually starts up. Just leave plugged in using a wall adapter (not computer)