5 
3 MBP powers down after 4 seconds (part 2)
In December I received great help from this site in relation to a MBP Model A1211 which would not power up properly. After trying all the suggestions and replacing a faulty fan with one previous ordered from iFixIt, the MBP worked again for all of 5 days. On days 6-7 the screen would suddenly go black while the laptop was in use. From day 8 onwards, I have been trying various tests and strategems, chiefly as suggested in answer to the "MBP powers down after 4 seconds". I once got the laptop to stay on for 5 minutes, long enough to retrieve the 10.6 installation disk from the drive, but that is the record time so far.
If the faulty fan has been replaced, where should I be looking next to get this laptop working again? Graphics card? Logic board?
Thank you in anticipation.
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The answer appears to have been "logic board". But I couldn't work that out from any other answers to this question...
por asmith