I am having a problem with my MacBookPro5,1 (more background below): the system will randomly lock up, with the following symptoms:
- Screen freezes up, no corruption
- System does not respond to keyboard or mouse input
- System does not respond to pings over the network
- No kernel panic message appears on screen
- No messages in the system log
I have so far been unable to reproduce the problem at all. It happens both when I am actively using the computer and when it is idle; both when the screensaver is running and when it is not; and it doesn't seem to be related to any of the peripherals plugged in (though AirPort occasionally acts up). The system passes memory tests (memtest86+ and the provided Apple Hardware Test) so that doesn't seem to be it either. Is there anything I can do to obtain more diagnostic information?
Background. I recently had to replace the main logic board, after experiencing a problem where the laptop would not power up at all. Since then I have been experiencing random freezes and I would like to know if there's anything else that might need replacing, or if I should ask for another replacement for the main logic board while the repair is still under warranty.