Hello All, I am running Mac OS X 10.5.1 on a Macbook Core 2 Duo 2.16 with 4 gb ram. The other day, my mac froze while in screensaver mode, so i turned it off. When I went to turn it back on, it stayed on the Apple logo screen for a while with the circle turning under it, and after 5 or so minutes it just restarts. I have tried clearing the PRAM with no results. When I go to startup disk mode, my start up disk DOES appear. I popped in my leopard disc and figured Id try an archive and install, but when I try to install, the HD has a yellow triangle with an exclamation point in it. When I choose to install it there, it says I need to change the installation settings, but the only installation setting that is available is to erase everything. Does anyone know how I can solve this problem? Any help is appreciated. Thanks in advance!