Probook 450 G2 - Boot problem

[RobertW1947]

First of all, I am Dutch, 75+ and my English is not 100%.

I have got a Probook 450 G2 with the following boot problem:

When startup the laptop with the power button, then 20 seconds only a black screen with a lightning power led.

Then 4 seconds a max blowing fan with still a black screen.

Then 4 seconds power off.

Then a automatic power on with black screen and after 20 secinds the 4 seconds with max blow of vhe fan and then the 4 seconds with power off.

This is repeating.

Sometimes in the 4 seconds with the max blowing of the fan I see a blinking led in the Caps Lock:

some 3x, sometimes 2x, sometimes no blinking.

I have tried all the solutions I have found, even replacing the 3V battery cell.

Also replacing the cooling pasta of the cpu.

And I was supprised not seeing a cpu socket, but a PCB with 2 chips, nameless, so I could not found the name Intel or ADM.

I have tested the memory with Memtest86 in another laptop, is OK.

My conclusion is: a seperate CPU and GPU being "dead" ??