Beeping iMac

Hi All,

Thank you in advance for your help.

We have this iMac at the office(old), and recently it started beeping. It beeps every 5 seconds once. So according to the info below, it looked like a memory problem. Although I have had upgraded the memory 4 years ago, I took the 4GB(2 sticks) "upgraded" memory out and put the original 2GB(2 sticks) back, and the same problem. I have ordered new 4GB(2 sticks memory) and still the same problem. And yes, I did try different slots, different combinations too. Same result every time.

However, if I unplug the power cable from the computer about 5 to 6 hours (does not matter which ram in it) then when I replug it, it starts without even pushing the power button. And it works until I restart it. When I restart it, again the same beep comes up.

I do not know what else I can try to fix this.

1 beep = no RAM installed

2 beeps = incompatible RAM types

3 beeps = no good banks

4 beeps = no good boot images.

5 beeps = processor is not usable