My isight imac got an insomnia

It won't go to sleep by itself. Only the display is off with a constant light on, not the blinking one. I have to tell it to sleep by using the menu command.
I've heard that if you have a usb peripherial plugged into the imac, it might not do auto sleep. I have a usb card reader but when I unplug it off, the imac still didn't go to sleep.
Do anyone know how to cure this insomnia problem??

Navin, USB peripherals are probably the most common cause (hubs and USB modems especially, but others can cause this too).
If this isn't the case, then you need to consider possible background software issues. Allume's "Internet Cleanup" has been reported as causing this with some OS versions. Other things that may be involved could be virus checkers, "button scanners" associated with scanners and printers etc, or anything else that runs in the background.
You might find it worth checking out what s actually running through "Activity Monitor" (in your utilities folder). Have a look too at the items listed under "Login Items" for your account (in System Preferences / Accounts), and try turning off anything which isn't absolutely necessary for you. Software installations often put things here without letting know at the time.
On rare occasions firewire or ethernet devices could also be involved. Try disconnecting everything except the mouse and keyboard and see if this resolves the issue.
Cheers
Rod

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