After restarting, the PC does not start (Video card, RAM). What to do?

Question

Video cards

My brother played on the computer, then everything was laid. We decided to restart the computer. No matter how many times we tried, always a black screen, the speaker is silent. Also, the red light at the RAM is on.
The video card is old. (MSI GeForce GTS 450)
We still don't understand what's going on.

Answer 1

take the whole box to the service, otherwise you will kill a tiny chance that they can fix it cheaply.