no post only power light glows up

vinaya bhargava

Estimable
Jun 27, 2014
5
0
4,510
I've had a Sony E series laptop, when i turned it on then there is black screen (off black color) only power light is powered up and fan is working, no HDD light is powered up. In short, there is no POST. I can assure that there is no problem in motherboard as 2 or 3 out of 50 times system boots and POSTs successfully. Possible causes and solutions?

Thanks in advance