Random Shutdowns Preceded By a Grey Screen Of Death
The problem. The machine displays the grey screen of death asking to be restarted. Boots right up and works normally without any hangups until the next shutdown episode. This happens somewhat randomly whether on battery or AC adapter.
The changes that have been done to the original configuration hardware-wise are as follows: added Kingston RAM, upgraded HD to solid state Samsung EVO one. That's about it. The machine worked like clockwork since it was bought for roughly 3 years (and after the above changes were made). I initially suspected the RAM and the HD (but I think those have been ruled out as I have swapped them back out with the same persisting shutdowns).
I also explored whether this may be a software issue, but had to rule it out after running the machine off of different HDs to see if the issue would go away, but alas it didn't. I inspected crash logs and they were no help. There is nothing there that suggests a reason for the problem. Someone suggested that the latter suggests a hardware rather than a software issue as well. Is that a fair assumption?
The shutdowns have been on the increase. First they occurred very rarely. Now they may happen as often as several times a week.
Someone else suggested a CPU/component overheating issue due to failing heatsink bond. Is there a way to prove/disprove this without tearing the whole machine apart? But then and again, I'm thinking the shutdowns are not necessarily related to the machine doing CPU-intensive processing.
Unfortunately I don't have access to the original Apple hardware test. However, I ran Tech Tool Pro test panel and it turned up no problems.
The question: At this point is it safe to assume it's a hosed logic board or there is another possible issue I haven't thought off that may be at fault. Puzzling. Any thoughts would be highly appreciated.
Is this a good question?