laptop battery will not charge

Hi
I have a laptop which works fine but when you plug in the psu the power light on the psu flashes and the battery does not charge so eventually goes flat. i have tried a new psu and the same light flashing occurs. i changed the battery for a new one as i thought it may be faulty. the laptop ran perfect until the new battery went flat.
the flashing light on the psu makes me feel there is a short somewhere but i have no way of finding out where.
the laptop is a D41ES generic rebadged laptop, now called “notebook”.
I hope somebody can shed some light on this.

kind regards

dave