To help isolate the issue, please hook it up to an external monitor and let us know what you get. You say the backlight is on, can you see the desktop at all? What color is the screen?
UPDATE - added because it was to long for a comment
Check the seating of your video card
Here's the skinny on reading the LED diagnostic lights:
LED Startup Sequence
LED #1 = Power available.
If no LED is visible:
• Verify AC source
• Verify known-good AC cable is connected
• Verify cable connection between AC inlet and power supply
• Verify cable connection between power supply and logic board
• Verify power supply
LED #1 + LED #2 = Power available, and system is powered on.
If second LED is not visible when power button is pressed:
• Verify power button connection to logic board
• Verify power button functionality
• Verify cable connection between power supply and logic board
• Verify power supply
• Verify logic board
LED #1 + LED #2 + LED #3 = Power available, system is powered on, and video card found.
If third LED is not visible after power on:
• Verify that MXM video card is seated properly
• Verify logic board
LED #1 + LED #2 + LED #3 + LED #4 = Power available, system is powered on, video card found, and internal LCD found.
If fourth LED is not visible after power on:
• Verify cable connections between LCD panel and logic board
• Inspect LCD display cables for cable damage
• Verify external video functionality, and according to result check the following items:
-If external display works then verify/replace LED backlight board
-If external display works then verify/replace LCD panel
-If external display does not work verify/replace logic board
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No display, just a plain black screen with no backlight just sounds, but I did check the diagnostics LEDs and I only get the 1 and 2 lights to turn on
da miguel fernandez
Well I desided to take it to the apple store, and they told me that it could be the logic board and that it may cost me about $700 or the video card and that will cost me about $100, I'm hoping it's the video card :)
da miguel fernandez
So it ended up being the video card, it's Just going to cost me $170 :)
da miguel fernandez