Macbook unibody backlight turns off while booting to 10.7

This is a customer unit, so I do not want to do anything to their hard drive without being completely sure that is the issue.
When attempting to boot a Macbook 13-inch Late 2009 (polycarbonate Unibody) to 10.7 on an internal or 10.7.5 on an external hard drive connected via USB the unit boots through the gray screen with Apple logo and spinning gear properly but loses backlight at the point I would normally get the blue screen. It does this in Safe Boot as well.
I am able to boot to an external USB drive running 10.6.8 without issue.
I am also able to boot to the recovery partitions of the 10.7 drives with no video issues.
When trying to boot to the regular partitions, the backlight turns off where the screen should be going to blue just before the login prompt or desktop depending on the account setup.
Has anyone else had this trouble?

i have the exact same issue i still have a applecare so i brought it to my local repair shop(filled with greedy lebanese men who ****** me over when i bought my macbook in march of 2009 2 days before the new macbook pros came out they were like nope u paid $600 extra for an inferior product but we're not going to refund you because u can **** yourself even though i called apple and they said they could replace it with the new one if i bought it from them but since i bought it from one of their repair centers and not an actual apple store im ******) anyway I brought it in several times and they told me that they first replaced the logic board then the they replaced the screen(which was obvious) and they told me they replaced the ram( they did and they downgraded my ram in the process i went in with 4gb of DDR3 @ 1333 mhz and came out with 2 GB of DDR3 @ 667 mhz thanks you lebanese cocksuckers) i made them fix their ram switch which they weren't too happy about and immediately lied to me and told me that there was no problem and that they didn't put different ram in. Then they told me that there was nothing they could do and they couldn't even find the problem i was discribing. since it happens randomly everytime i brought it in to show them how it wouldn't start up or it would turn off randomly it miraciously worked fine. ******* apple, I'm going to call them and demand that they prepare a complete replacement which the lebanese guy told me was impossible, they would not replace the whole macbook just because i had a problem. I too upgraded to mountain lion to try and fix the issues, i then reformated my macbook and downgraded to snow leopard and still the issue remains. *** are we supposed to do this is a chronic issue with many many macs and apple hasn't yet come up with a solution to a problem THEY caused.

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Hello^^
I'm trying to mount my external USB Drive.
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Last edited by cl10k (2011-03-20 22:49:43)

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Last edited by bohoomil (2011-03-19 16:57:36)

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