Question Bios is not starting, black screen after work using integrated GPU

[fifinho19]

Hello, yesterday I wanted to borrow my brother graphics card, because his was broken. After few minutes of using integrated GPU my screens (I connected two) were frozen and after few seconds green lines and pixels appeared. I rebooted PC and then there was only black screen, no BIOS, nothing
When I connected old external GPU everything was the same - black screen, no signal. I can't see BIOS settings.

I reset CMOS, upgraded BIOS by USB but nothing changed :/

Motherboard Asus H87-PRO + Intel i5 CPU.
Now DRAM LED is lighting, but MEMORY OK button didn't help.

What can I check? And how? I have no speaker on motherboard.

 

[logainofhades]

Try a CMOS reset. Bios might be a bit confused, changing the hardware around.

 

[fifinho19]

I did it, CMOS reset on MB and also remove the battery . It didn't fix the problem.

 

[logainofhades]

What are full system specs, including make/model of the power supply, and the graphics cards you tried using?

 

[fifinho19]

Asus H87-PRO
Intel Core i5-4670K
Geforce GTX 660
Power supply NeoTec MAXIMUS 600W