I have a Gateway M675 that over heats and shuts down. I took it to a repair shop and they took out one of my 512 ram chips and replaced it with a 64 ram chip. I did have 2 - 512 ram chips. I was told that this was the cause of the over heating. Should I just replace the 512 and 64 with 1 gyg chip? Can ram really cause over heating??