So I have a new iMac, and I only got the 1 gig of factory RAM with it. Well today I bought a stick of Corsair RAM, same specs as the factory RAM, and what the little "Everything Mac" manual says to purchase, got home, installed it, turned the machine on, heard the startup sound, saw the apple appear on the screen, and then the system rebooted. From then on out, it was stuck in this reboot loop. I removed the factory RAM and tried to boot with the Corsair RAM, and the machine would power up, but the screen was black, and all I heard was the optical and harddrive making sounds, that was it. Turned the machine off, removed the Corsair, reinstalled the factory RAM, and the machine was fine again. For those of you in the know, what does the problem sound like it could be? Bad RAM?