Well yesterday I bought another 1gig of RAM of same speed and same company.But it crashes randomly.I can't play games.I then took out my older one and installed this new one but it didn't boot.My PC jus show auto detecting bios and rebooted again and again.Now again I am using only my old 512 MB RAM.So what can be the problem?Do I need to tweak my bios or do I have the faulty RAM?