4GB RAM upgrade iMac 7.1 into a coma
Followed instructions explicitly and installed a pair of compatible 2GB modules from Crucial. Switch Mac back on and fan whirls but screen doesn't appear and machine 'acts dead'. NOT grey screen of death - just nothing - blank screen.
So remove one of the modules and the machine works fine BUT ONLY WITH 3 GB RAM. Doesn't seem to matter which slot the 2GB module is in, a total of 4GB results in the machine not starting. I got a replacement pair of modules from Crucial, incase one of them was duff, but the problem persists.
I've seen this posted a couple of times in other fora, but no solutions posted.
Any suggestions?
Cheers
J
MacBook Pro 17", Mac OS X (10.6.3), iMac 20" (iMac 7.1 Intel Core 2 Duo 2.4GHz)