Chosen Solution
Replace the logic board on my early 2011 MacBook Pro 15 inch and now the screen won’t light. There is a short flash of light when it starts up but then it goes black I’ve removed and redone the connections and still the same problem. Any suggestions out there?
Hook it up to an external monitor for diagnostic purposes. As Jessa stated there were GPU issues resulting in a class action law suit and subsequent repair program, which of course has now expired and Apple is no longer honoring. https://www.apple.com/support/macbookpro… Please give us a history on your problems with this machine and the source of your replacement parts and what led you to do the replacements.
