[64 bit] Dell Studio 1555 sudden shutdowns

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http://ubuntuforums.org – I've attached the dmesg output with this email. The problem is that the laptop shuts down suddenly. With the Unity interface, sometimes opening the Unity menu used to trigger such a shutdown. Sometimes, putting Skype on fullscreen causes the machine to power off, and usually, a resume after standby causes the machine to shut down. By shutting down, here, I mean losing power. I ran a memtest on this machine but got nothing out of it. Overheating can also be ruled out since sometimes it happens right after powering the machine up - right at the login screen as soon as you select your user. Th (Hardware)