I have a Mac G5, dual 2 GHz with 1 GB SDRAM and 2 hard drives, each 500 GB. I am running OS 10.5.1. My computer is soooooo slow! In the past few months it has gotten increasing slower until it is now just infuriating. It doesn't matter what application I'm using, it just drags. I haven't installed any new software. A few weeks ago one of my hard drives started knocking so I replaced it, but I was having speed problems before my main hard drive went out. I had hoped that when I replaced the hard drive my speed issues might be resolved, but they weren't. My internet is fine; it's just my applications. For example... if I click on an InDesign or Quark document it takes a couple of minutes for the document to open. What can I do to speed up my computer? Please help!!!!