iMac Keeps Waking up for no apparent reason!

[SaSaSushi]

Unplugged the cable to the printer (even when it's off) and viola. iMac goes right to sleep and stays asleep.

Strange for sure.

Yeah, it's some USB activity from the printer for sure. Like I said, with my printer (a 3 year old Canon multifunction inkjet) if I leave it in the state it is in, either off or on, the iMac will not wake up. But if I happen to change it's state while the Mac is sleeping it will come on immediately.

My best guess is that some signal is sent out over USB when entering sleep mode to which your HP is somehow responding to.

I hope you get it sorted. I understand how unplugging it, while a solution, is hardly ideal and a bit of a pain in the butt.

 

[Mork]

Yeah, it's some USB activity from the printer for sure. Like I said, with my printer (a 3 year old Canon multifunction inkjet) if I leave it in the state it is in, either off or on, the iMac will not wake up. But if I happen to change it's state while the Mac is sleeping it will come on immediately.

My best guess is that some signal is sent out over USB when entering sleep mode to which your HP is somehow responding to.

I hope you get it sorted. I understand how unplugging it, while a solution, is hardly ideal and a bit of a pain in the butt.

Thanks.

 

[yashrg]

I am having the same problem and this is the first link I stumbled upon through my google-fu. I don't have anything but hard drives connected via USB. I do have a kodak wifi printer tho, however I did disable wake for/over network and iMac still keeps waking up! Worst of all, the big screen is just so bright in the night!