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Sleep, Shutdown issues in OSX and Windows

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I have a Dell Inspiron 530 Desktop that is running Mountain Lion quite well. But it does not sleep and it does not fully shut down however it restarts just fine. In OSX, it exits the OS and then the fans stay on and the screen stays blank. I have to hold the power button to shut it down. In Windows 8, it does the same but when I press and hold the power button, Windows' login screen shows up again. I then have to restart and hit the power button as it is restarting.


In OSX, sleep only kills the monitor and the sound. All the notifications are played when I wake the computer. But the lights stay on and power consumption is unaffected.


I was wondering if anyone has seen anything like this. I had to replace the PSU on the box because the old one died and I have installed an old OCZ 500 Watt I had lying around. Could that be causing this? Is there anything I can do to check?


Thanks in advance.

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You may need to extract DSDT and SSDT but I am no expert, or you may need certain kexts, I have a problem with Sleep / stndby mode as once it enters those modes she never comes back.

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