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Turns itself on from hibernation?

My Dell Studio 1555 laptop (conveniently, just off warranty!) has a habit of turning itself on from hibernation. I've set it up to hibernate when the lid is closed, which it does fine, but sometimes (and after a seemingly random length of time) it turns itself on. The screen lights up (despite lid being closed) and it sits there at the unlock screen. If it's on mains power, that's kind of ok, but I find the blue light irritating (not to mention it's a waste of power) so I tend to unplug it at the wall when it's not being used. If it's on battery though, it'll happily chug through the whole battery, before hibernating again. This is particularly annoying when I open it up in labs at uni to find it completely dead.

Any ideas? I'm stumped- I don't think it's the lid sensor as it shouldn't (and doesn't) start up from hibernation without the power button being pressed, and I don't think it's the power button for the same reason!

Yay for engineered obsolescence. Why do things have to go wrong 1 month after the warranty finishes?

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Felix,

Welcome to ifixit. First off I believe this is caused by a background program that is waking your computer when it decides it needs to update, scan or requires more memory. I found this on my pc was caused by a virus program that was scheduled to run and did not support hibernation. Now I leave it on during the day and off at night until I can afford to make my boot disk a solid state drive! Also although it is convenient to close the cover to put your laptop into hibernation you should shut down and re-boot periodically anyway. During the day hibernation is the way to go if you use the computer daily then shut it off at night and let it charge fully. When you start it in the morning it takes a little to boot but you will experience less of the situation you described. I posted this in the answers although I really didn't fully answer your question but thought this solution might help you.

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Marc, I don't think that it's a piece of software- I don't think that software can wake the computer up if it's already hibernating? I do tend to turn it off properly overnight.

The problem is that it wakes itself up, with nothing touching it or anything. It's not waking off LAN (it does it when not plugged in) so I'm really confused by it.

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Felix, I tend to agree with Marc. It does not sound like hardware but more like a software issue, and yes there is software that "awakens from hibernation" Do a good scan on it and make sure that you turn all your auto updates and back ground software off.an example is here http://johnsonyip.com/wordpress/2010/04/... This way you eliminate that as a possibility. Good Luck

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