Someone brought me this macbook to take a look at. It has a strange problem I cannot figure out. I apply power, it will chime and the screen will light up grayish/white for a second, then it goes black. It will stay black until the login screen. From there, it just goes to sleep with the breathing white light. If i hit power, screen lights up and shows login screen sometimes. sometimes not, and you need a flashlight to see it. This will stay for 5 seconds and then it goes back to sleep again. I tried another power brick, same thing. the battery is charging. I decided to remove the logic board and check for any spill damage, and there is none. I tried zapping PRAM, resetting PMU, etc. no difference. Even removed the battery and power for awhile. Tried recovery mode, it will still go black in recovery mode and into sleep. if i hit power, i see the recovery screen for a few seconds and out it goes again. Removing the HDD has no difference either. It will still chime and go grey, then black. any ideas?