Came in with weird sort-of shorting out problems. Replaced system board and processor, worked fine for a couple of days, then went on the fritz. We found that the two screws near the LCD seemed to be causing the system board to short out If you pulled those out, it would turn on and behave. Then two days later, it's back in with what appears to be a dead system board again. I'm just at a loss- the power adapter is fine, checked that out with a voltmeter. Stripped it down to just the system board and added in one component at a time, still won't post.