At random times OSX will lock up and become completely unresponsive without displaying any error messages. After a hard reboot my laptop will not turn back on unless the CMOS is cleared. I have also noticed that a small rectangle of pixels (about 5x7) in the upper left corner of the screen turns black.
The issue has been persistent through several versions (10.6.8-10.7.3) of OSX with a variety of system patches, power management options and DSDT edits. Any suggestions for a solution or logging and isolating the problem would be greatly appreciated.
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