Macbook won't sleep

my first-gen macbook running 10.6.8. few weeks it's been going sleep sometimes, when close lid. i've been poking around on web , through lot of forums. here's i've tried:

• checking printer queue , uninstalling printer
• there no bluetooth devices enabled
• unplugging, removing battery , holding down power button 5 seconds
• resetting pram
• resetting smc
• repairing permissions
• setting sleep apple menu doesn't work
• logging in user gives same problem
• booting in safe mode doesn't work
• resetting energy saver settings default
• opening terminal , running pmset -g assertions (this gave me 0s except enableidlesleep 1, didn't give further information)
• installing pleasesleep, setting energy saver sleep in 1 minute--it still won't sleep.

update1 typed syslog |grep -i "wake reason" terminal , got whole buttload of responses. seems there usb error happening causes wake. example: wake reason=usb4 usb7 mean , how deal it?

update2 remembered macbook set synch wife's ipad2, disabled feature on ipad2 , on macbook. didn't help.

interestingly, did go sleep when let time out naturally according power saver setting before installing pleasesleep. happening here?

 

you may find useful ideas here. perhaps there's missed:

mac os x: why mac might not sleep or stay in sleep mode
determine why mac wakes sleep
one sleep problem caused printers - solved ... and another

 

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