hi all the hard disk on my Powerbook G4 12" 1.5ghz seems to be on the way out - again! I bought it about 18 months ago and 6 months later i started to get intermittant crashes (the one where the screen goes grey and tells you to restart in 4 languages, kernel panic i think) they became more frequent and after a few reinstalls the HD died altogether and i got on to apple and they replaced it so i've had the new HD for 6 months now and the crashes have slowly started to come back. so i ran Disk utility from my startup disk, repaired the disk and permissions and the crashes stopped for a while. but they came back when i tried to edit some video footage over the weekend and now when i run Disk Utility it gives the "the underlying task reported failure on exit" error just like it did before the last hard disk failed! it seems really unlikely that I would get two dodgy HD's in a row. is it possible that it's something else? how would i find out? I have replaced laptop hard disks before so i have no fear of that but how do i know that i wouldn't be back here in another six months. Is disk warrior the way to go? is there another way of analysing the problem before i splash out on a solution? ------------ i've added the following to see if the way i use it has anything to do with this - i expect most of this is irrelevant but you never know! I use the computer for about 3 hours a day. I rarely turn it off, leaving it on sleep instead. I store it vertically (behind the counch for security!). I have activity monitor running all the time (i like to see memory usage in my dock). I use camino.