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On a recent Windows 7 (fresh install), I cannot suspend the computer, as it will immediately turn right back on. I was able to suspend just fine running on XP. Also this is a desktop machine.

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I had this issue on Vista as well. I thought it was a touchy keyboard or mouse (using a logitech wireless combo) but 7 doesn't have that problem on the same hardware. – Rob Allen Jan 29 '10 at 14:46
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This was the same problem that I had before. If you have a laptop, change the power plan to Balanced not High performance because it interferes with standby.

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If you run the Windows 7 troubleshooter and view the detailed report, it will say, "High Performance uses additional power and might prevent the computer from entering sleep mode." – Aznfin Jan 29 '10 at 14:59
Hm, still no go. – Zombies Jan 30 '10 at 0:54
Sorry I couldn't be of help. Hope you figure out what's going on. – Aznfin Jan 30 '10 at 2:25
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up vote 2 down vote

I have seen this on some laptops when they are not flat as the touchpad/pointer sometimes registers a move which will bring it out of standby.... Alternatively as @Rob Allen said in the comment, it can be a dodgy keyboard or mouse.

I would recommend that if you are happy just using the power button, take a look in Device Manager and for your keyboard/mice, go in to the power management tab and uncheck Allow this device to wake the computer.

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If you are still having problems, it could be that your BIOS is set to the wrong power management settings, try and see if there is an option to enable standby.

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This doesn't seem to be the problem. – Zombies Jan 30 '10 at 0:51
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