Macbook wont go to sleep on its own

hi guys...my macbook wont go to sleep on its own. i mean, Energy Saver Preferences is set to turn-off the display in 1 minute, and to make the computer sleep in 3 minutes - but the macbook wont turn off the display or sleep, based on the settings. Bt the way, when i make it sleep (Apple menu or by using Command-Option-Eject), the computer sleeps - no prob when sleep is manually executed.
Help please!
Thanks

X423424X wrote:
Yes. But (a) sometimes you never can, (b) it may be caused by something you need or refuse to part with, and (c) it's just not worth the effort if there is an simple alternative solution.
In my case I think (not 100% sure other than a usb cause) was/is (b); a non-apple usb wired keyboard with its own usb ports or a bluetooth dongle plugged into my 27"s usb port. I am not about to part with either of them. And it just wasn't worth my time narrowing it down any further if that was at all possible so (c).
hi, i take your points, given you start your reply with "yes".
i'm in a similar boat and i've spent far too long scouring the apple discussions for a solution (with some issues you're better off googling than coming here for truth). i have also got a case open with my applecare coverage but the responses so far have verged on ignorant (i think they respond badly so you go away), so on we go.
i'm astounded that the terminal command pmset -g doesn't always provide an answer, but it seems a decent part of the solution. checking over the console and activity help too.
i've never had the issue with other hardware, so it must be a combo regarding the newer stuff + lion, wouldn't you say?

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    MacBook Pro - model: MacBookPro8,2
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    4 GB RAM
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    AMD Radeon HD 6490M - VRAM: 256 MB
    Intel HD Graphics 3000 - VRAM: 384 MB
System Software:
    Mac OS X 10.6.8 (10K549) - Uptime: 0 days 0:24:42
Disk Information:
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        Macintosh HD (disk0s2) / [Startup]: 465.44 GB (229.26 GB free)
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USB Information:
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    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Computer, Inc. IR Receiver
FireWire Information:
Thunderbolt Information:
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Kernel Extensions:
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