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Message: <blockquote data-quote="JorWesFlow" data-source="post: 712091" data-attributes="member: 64681">Black screen on boot, no boot chime, fan overdrives, no responseI tried some things on my own:Tried to reset the parameter RAM, but didn't make a difference. I also tried booting to Open Firmware to reset the PRAM that way, but still can't even get to Open Firmware.I keep getting the same result... black screen on start up, no boot chime, fan overdrives, no responseI also:    * Tried reseating RAM: same result (black screen on start up, no boot chime, fan overdrives, no response)    * Tried starting up without RAM: no RAM tone indicator    * Tried disconnecting the battery and power source and hitting power button to discharge everything, then replaced everything: same result (black screen on start up, no boot chime, fan overdrives, no response)Any other suggestions? I'll try them all before I buy a new logic board--if I even go that far...</blockquote>