MBP does not boot despite the chime and white screen
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I try to fix a macbook pro A1278 2.4GHz. When starting it you can hear the chime, the screen gets white/grey. Nothing else happens. You have to push the start button for 5 seconds if you want to switch it off.
The keys do not cause any reaction. Except the start button.
What i have been trying until now:
- Several resets, pram and so on
- safe mode
- single mode
- verbose mode
- changed the ram
- changed the HDD Lion and Sow L
- target mode
- recovery mode
- pushing trackpad-button to eject the dvd
- external keyboard / mouse
Nothing happens. But there is the chime and the bright screen. Has anybody got any idea? That would be great.