Ibook black screen

Hi everyone ! I've got a huuuuuuuge problem with my ibook, and I think I know where it comes from, but I'd like to be sure, as I'm not a pro, I might find some answers here... I've used my ibook this morning (1,33 Ghz, SD), and it worked perfectly fine. I closed it, so it switched to sleep mode. I tried to open it at the beginning of the afternoon, and boom, nothing... The screen refused to switch on. Without panicking, I tried to reboot my computer, and just after having hit the start button, the fans started to work really loud, for a second or two, then stopped and the usual start up sound rang, without any change on the screen. So I tried to reboot in safe mode, no result. I tried to reboot after having unplugged the 512 Mo of RAM I had added a few months ago. It worked (I felt relieved for a few minutes), but I rebooted just to check, and black screen again. Then I tried to reboot and zap the pram. I obtained the strangest result : the screen went red, then green, then blue, and then different shades of grey to finish on black. And the cycle kept returning in that precise order. I forgot to say that after having removed the added RAM, it worked, allright, then I rebooted and tried to press at the same time on the left part, beside the trackpad. The screen went grey, then went all weird and started to "flicker"... My serial number does not meet the logic board changing program requirements, and the first year anniversary was three weeks ago... If someone has a clue, a solution... (other than changing the logic board of course... 500€...) Thanx !

Thank you for your answer. I've called them today, and they told me that my warrenty was no longer active. So I refused to pay for the telephone assistance, which is useless in my case, as I think the problem comes from the hardware... I'll try anyway to find an apple certified store, as we in France don't have any apple store or real apple center...

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