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Hey guys, I solved the issue!! I made the NVRAM Reset from Open firmware (Command+Option+O+F; then tipe: reset-nvram and hit return reset-all and hit return. The machine reboots and everything's OK) For those who did this and still no result, I found a step further: how to find hidden PMU...

Yes, I think you should do it. I've spent some hours (weeks) trying to fix the problem, but non of the solutions offerd on various forums helped. Of course, thanks to all people who shered their experiences on the Internet in order to help, but it just doesn't seem to be enough. So I sugest you...

So, anyone else have this, or MacSlafko...did you solve yours? No, I didn't (so far). I did PRAM reset, i trashed the Prefs on Macintosh DH and in both user's Libraries and I tried to do this NixGeek's tip, but my computer (in command prompt) says that it can't find this "/sbin/fsck -yf"...

My iMac won't go to sleep although I have set the timing for that (30 min) in Energy saver. It works alright when I manually choose Sleep from Apple menu, but it doesn't work when I leave the computer for an hour or two. I've noticed some "click" sound every 10-15 minutes, but I don't know how...