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

Hi,

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?

UPDATE:

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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Chosen Solution

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)

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

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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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