Pantelis Proios, I am not a Mac person, but this could be caused by numerous things. It could be your LVDS cable, your backlight board, or your video card, as well as your panel, just to name a few. Connect a supported external display to the mini DisplayPort on rear of computer. Verify if issue occurs with external display. If it does not, you know your card is okay and you may have to further investigate. Check to make sure the LVDS cable is properly seated. If you got to start replacing parts, I start with the cable and the backlight board
LED backlight board 661-5304
Cables, AC/DC Power/Backlight/SATA 922-9125
Cable, LVDS 922-9132
Hope this helps, good luck.
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