Posting this particular solution to serve anybody that can experience similar symptoms. It seems like the power source evaluation from some old BIOS firmware, in the moment of the initial power up on a heated hardware, is leading to incorrect fast diagnostic and ending up with the wrong type of led indication - 3 amber and 5 white blinks. In my case that was the old BIOS version 1.3.2 on a Precision 7550 platform. It could be some old BIOS on another platform as well - like Inspiron 7560, where that led code has exactly the same meaning. A simple BIOS update to version 1.6.2 resolved the issue for me. From all of the above, the BIOS update could be a logical first troubleshooting step, before to conclude that the laptop mother board really needs a replacement!
Dear sirs, kindly advice me about how to solve the Start Up issue of Inspiron 15 756 Model. While Power On button pressed, Battery light LED Blinks in the format like 3 times in Amber color and 5 times in White color. Then found, for Start Up, i need to plug charger with Laptop and Press the power button for 5 Secs. Then release the Power Button, then again normally press Power Button. Now its starting as normal way. But this kinda method is not permanent. So please help to resolve this issue friends. Thanks you.
Inspiron 7560- 3 Amber, 5 White Blinks