Man my laptop just froze in the same way three times in a row, abruptly jiggling the screen and inserting a few lines of video garbage each time. Hope something's not wrong with the hardware. It did it twice while plugged into the wall, and once on pure battery power. I am trying it now with plugged-into-wall without battery, and so far it's run okay longer than it did before...

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Edit: I put the battery back in and it instantly froze up again. I will definitely be trying to buy a new battery tomorrow to see if that helps. It will be really annoying if it is something on the battery-controller-whatsit-side of things. I would not like to be forced to use AC power only.