HP Compaq CQ60 not working

[westbengal532]

Hello.
I'm writing from Italy.
I have this CQ60 which was not showing anything on display, neither by plugging an external monitor.
I thought the video card had gone and I replaced the mobo with a working one, but the problem remains.
I am an amateur hardware fan.
The fan works, the lights go on but the display is black.
On the palmrest's bottom left hand side there are three small leds: only the first one lights up, the one I think that shows that power is on.
I never had this problem before.
Can anyone help?
Thanks a lot and best regards

 

[Lutfij]

Do you see any LED flashing if you remove the ram from the board? You may want to see if the HDD works by connecting it to a desktop. Chances are that the ram may be faulty if your HDD is intact and that the motherboard is known working.

 

[westbengal532]

I shall try as you say but previously I tried various Ram but the problem remained. Also I dont know about the HDD but what I know is that I cannot even access the Bios.

Yes there is. I took the rams off and turned the laptop on. On top of the keyboard frame there is a white led flashing.