2.2, 2.4, 2.5, or 2.6 GHz Core 2 Duo processor

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blank screen after normal boot up, external monitor works, fan noise


my MacBookPro 15" Core 2 Duo (2,66) (running lion) started suddenly to show following behavior:

*boots up normally, screen shows apple logo and turning wheel, (also gets into target mode, boot disk selection mode etc normally (that means on the primary display)

*then, just before login window, the screen blanks. if an external monitor is attached, the login screen appears on the second screen. "About this mac" only shows the secondary display.

*pram reset, battery reset, same behavior. booting from lion#s recovery disk: same. booting from snow leopard external usb-disk: same.

Any ideas?


i had noticed that the fans was doing a more noise than normal (sorry for not posting this information, thought it would be due to repeated booting). During one startup the noise went down, and i was able to boot normally... this lasted only a few minutes, during the next startup both problem (fan noise and display blackout) persisted. The noise seems to affect the left fan specifically. Computer is otherwise running normally, i am just writing this lines with it. Orderer a fan from ebay to day, lets see. Still, anybody knows an explanation?

Answered! View the answer I have this problem too

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Try a Safe start holding down the Shift key. Boot from your original system installation disk and run repairs with Disk Utility.

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thank you, did not work, but now i think it may ba a hardware-fan relate issue (see update)


Can you see the desktop dimly or does the display change when you move it up and down?


Does you machine have the Nvidia 8600 GPU?


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Have you tried updating your FirmWare?

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thanks, firmware was latest stand, see update to original posting


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Francisco Fernandez will be eternally grateful.
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