Hi I have a Macbook which crashes 5 seconds after starting up. After reading on several forums I decided to do a clean re-installation of OS X Leopard. When I had inserted the installation DVD and pressed the option key, the only icon that showed was the harddrive and not the installation DVD. This was really frustrating and even though I knew the Macbook would crash I decided to click the hardrive icon and start up normally. However the Macbook started up perfectly normal and ran smoothly for hours (10 seconds was the longest it had run for 1½ month) where I was able to salvage all of my data. All the time it ran as normal was while I still had the installation DVD in the the DVD-drive. After saving my data I accessed the installation DVD from within the running OS X and started the re-installation of OS X Leopard. The re-installation went perfectly normal and shotly after I had a Macbook with an all fresh and re-installed OS X. After this it functioned perfectly for hours but I hadn't removed the installation DVD from the drive. I thought that everything was now working and was really happy that I once again had my Macbook up and running. In the evening I ejected the installation DVD and turned off the Macbook. The next morning I turned it on all happy about it working again. However after 5 seconds it crashed. I was sooooo dissapointed. I tried to insert the installation DVD again, but it even crashed before reaching safe-mode. Please someone help me. I don't know how I can get my Macbook back to life and I really need it. P.S. At first I thought that the problem was overheating but after having it running flawless for hours yesterday, I have ruled out this problem.