Macbook pro 2.2 screen won't turn on... sometimes

as soon as i start the computer on batteries, i can hear the start up sound but the screen seems to be off (actually i know it is on, but on minimun brightness). if i plug it to the ac power it usually solves the problem in a few minutes.
contacted apple support twice, they asked me to reboot with altapple+rp keys pressed, and also to remove the battery and keep the power button pressed for 5 seconds.
nothing.
i ran the system diagnostics, and not a problem reported.
at the macfixit forums someone mentions the mbp pro needs a firmware update...
http://www.macfixitforums.com/showflat.php?Cat=&Board=Forum19&Number=817417&page =0&view=collapsed&sb=5&o=31&fpart=1

The green light indicates that the battery is not being charged. What happens when you press the external battery check button on the end of the MBP?
Ciao.

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dtrewitt wrote:
It had OS8 on it
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If you've a 2013 model, depending on when you purchased the machine, I would suppose that you're still under warranty or at least purchased AppleCare? Regardless, I would take the kit to your local Apple Store or an AASP and have them diagnose the computer (and, if you're still under warranty, fix the computer) and, if necessary, give you an estimate for repair.
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Good Afternoon -
When it comes to computers, I'm basically a PC guy. I"m a network admin for a big company and work with Windows all day. I'm an advid iPhone / iPad user too, though, and do a bit with OSX.
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"Any suggestions would be great - Thanks!!!"
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Hello
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[email protected]

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hi,
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"Any suggestions would be great - Thanks!!!"
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Macbook pro 2.2 screen won't turn on... sometimes

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