Diagnosing a dead MacBook Pro
Solution 1:
I had the same issue when upgrading my RAM.
It turned out that the SO-DIMMs were not properly inserted.
Try the following:
- take out both SO-DIMMs
- re-insert the first one and make sure it goes fully into the lower socket
- try rebooting
- if it works, shut down again and insert the second SO-DIMM (again taking care to fully insert it into the upper socket.)
Good luck.