This is going to be long winded, and I have found no one that can help. . . . yet! . . . I have a MacBook Pro running 10.4.8, I have just done an erase of my hard drivr and reinstalled my software version above (i did upgrade to leopard but found too many conflicts so went back to tiger) The computer keeps throwing up a dark box telling me to restart my computer which i did, this still went on for a few weeks untill it would not start up at all the little dial thing would be on the screen running around but would not kick it, i phoned my friend whom suggested that on start up hold down apple s key which i did and he talked me thru the fsck -fy to do a hard drive check and repair which i did i then rebooted my computer and all was okay, well thats what i thought, but the problem did not go away,to the point that nothing would work at all, so i had my mate put in a new hard drive with leopard on it and that had a lot of conflicts on it plus it did not cure the problem, me thinking that it was probably the leopard system that was causing the problem, i wiped the new hard drive clean and reinstalled my old tiger system and all was okay until this morning when the dreaded dark box was there again, so i just held the restart button down and it kicked in again, i am getting to the point of switching to windows and buying a new pc, but as i have been a mac user for many years i am reluctant to do that, plus my three brothers and one sister are all mac users so we have a little bit of experience between us, but not enough to cure the above. . . . PLEASE HELP!!!!! if you can and in simple terms as i am not by far means an expert at all in computing . . . .to whom this may concern . . . in advanced thankyou for any help. . . i will of course keep you informed of any news . . . good or bad. Thanks Dunstablian.