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Hi. yesterday i found a old Macintosh Quadra 950 in my grandfather house. I also found the mouse and keyboard and i was very excited to turning on. but when i connected all the various cable and tried to turn it on it happen this: https://youtu.be/m2fO49GbsRk Someone know whats the problem ?

I don’t know what that bumping sound is. Are you continuously hitting the power on button? First thing to do is to replace the PRAM battery. It is a 3.6 holy 1/2 AA battery on the logic board. Does it have a hard drive in it? Do you have any history on the machine?