Recently, my computer has been starting up and sometimes nothing would appear on my monitor. I read up on how to fix this and re-inserting the ram would apparently fix it. I did it and it fixed it and everything was fine, but when the same thing happened today, I re-inserted the ram, started the computer up and it lasted for about 30 seconds before crashing. I turned off the computer, turned it back on and the same thing happened. I did this once more but this time the monitor didn't turn on. Is there a way to fix this without having to buy new components or are some of my components faulty?