My 2010 MBA 13" has begun to give what I'm concerned are the death rattles. Disclaimer: I'm a student and this computer has been abused for two years straight. It's spent 90% of its time being carted around in a backpack. It's taken a 5' fall from someone's arms onto pavement (and got only a ding in the process -- screen is intact). I was planning on replacing it with something more powerful in January or March, depending on money, so it's not the end of the world if the news is bad. Symptoms: Occasionally when waking from sleep by raising the lid, horizontal lines like static on a TV appear. They disappear when I close the lid and re-open it. About every 3rd time I wake it by opening the lid, I get the white screen and "Your computer must restart due to an error" message. There is an intermittent problem with the keyboard where it stops responding unless each key is mashed very hard, and with long intervals between each press. Sleep/waking it fixes this as well. Startups are normal. RAM usage is low; the most I run at any given time is Adium + Chrome (3-4 tabs, no flash) + Textedit. I checked disk permissions this morning and did a repair on them. Not sure if a clean install of ML would help, because it seems like a hardware problem, but I'm willing to give it a shot in a few days when I have some free time. Any suggestions for troubleshooting would be appreciated.