R400 Facing problem with Black screen no display

It all started when i using net half way my screen freeze with lots of altered colors.
I have tried to oning laptop series r400 and it loads till windows screen and then it goes blank screen after that.
I am certain that the latop is still running and everything is fine just that there is no display output.
I have tried to enter the bios setup and changed the output from discrete to integrated output and also disabling the auto selection for display output (third option) and i found that it works so i probably guess problem could be with discrete display output.
However, i am not 100% certain that it is the main problem for this blank screen. Is there anyway i can verify this problem or best find the solution to it. Reply me thank you
Moderator Note; subject edited.

light on but no boot sound.
No "chord" on startup means the Mac didn't pass it's startup diagnostics tests.
Try here >   Resolve startup issues and perform disk maintenance with Disk Utility and fsck
It would only boot after some 20 minutes after several attempts.
If you can get it to boot to the desktop, check to see how much free space there is on the startup disk.
Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. Make sure there's a minimum of 15% free disk space.

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