If your Laptop stopped charging or no power at all�� please check the DC power jack first. 
Mostly the problem is the DC power jack broken�� damaged or burned. 
You could replace the broken/burned DC power jack in the motherboard by yourself and fix and repair your laptop.
Many repair centre will keep as spare parts for replacement.

Fully Compatible Brand/Model : 

HP Omnibook XE3 series 
HP Pavilion N series N5000, N5125, N5135, N5140, N5150, N5170, N5190, N5195, N5210, N5221, N5240, N5241, N5250, N5261, N5270, N5271, N5290, N5295, N5310, N5311, N5331, N5340, N5341, N5350, N5351, N5361, N5371, N5381, N5390, N5401, N5430, N5440, N5441, N5444, N5450, N5451, N5461, N5470, N5474, N5481, N5490, N5491