Hi MR, Like the title says, my iMac is beeping once every five seconds at startup. Results from Google all say this means the iMac is not detecting any RAM. First I tried reseating the RAM, in the same slots, different slots, and that didn't work. Then, thinking that my RAM sticks went bad, I bought new RAM. Put them in and they didn't work either. So now I have no idea what's wrong. Is this now a problem with the logic board not detecting the RAM? am I going to have to replace the entire logic board?