so my mbp started actin weird right before christmas break, and i brought it into a mac certified store. when i tried to boot it up, it would stop at the grey screen and the appl ewould flash with the circle with a line through it, so i tried to boot it up while pushing command shift s and it said it could not find the mach_kernel.......so i did have my disks (stupid) and brought it to the store, and got it back today. restarted tiger and all that, and now i keep getting kernel panic. so i used me reinstall disks and it still does it. please help me macrumors users!!!