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Message: <blockquote data-quote="baloutang" data-source="post: 697161" data-attributes="member: 62074">I have a powerbook G4 15" 1.5GHZ with 512MB RAM. My issue is when I start to boot up my system, I get 3 low tone sounds. I researched it a bit online and noticed that this could be related to the RAM. So I removed and replaced the existing RAM and I got the startup screen, but it was frozen. I tried doing that again but I was back to the 3 tone sounds. I went ahead and purchased some new RAM (Crucials 1GB SO DIMM PC2700Pb). I inserted the new RAM and the same issue happens (3 tone sounds, spinning like it's booting, but nothing on the display). I've also done a PRAM reset to no avail. Does anyone know what else I can try to get this to work or is possibly my logic board the problem?</blockquote>