I have an AMD Athelon 2800+ and my OS is windows xp. I opened my case to see the speed of my ram because I was planning to buy more with my Christmas money. I think I was accidentally putting my RAM in upside down for a while and trying to jam it in there because I wasn't wearing my glasses at the time. When I realized it was upside down, I put my RAM back in fine and when I turn my computer on now, the monitor doesn't recognize my computer is on and my tower doesn't make the beeping noise it usually does during the boot-up process. Can anyone please help me?