My computer doesn't boot.

Hello,
GOOD DAY!!
My computer was turned on for 6-7 hrs. and after that it shut down so i decided to turn it on again but it started hanging during the POST, after a number of restarting it ended up with a black screen. I already tried to you use an eraser to clean the gold plate in the memory and reseat it, but nothing happens. I have also tried to start my computer without any RAM and i received no beeps. What do you think sir is faulty?

Thanks in advance!!