I have a 13" unibody MacBook running 10.5.8 When I start it up I get the Apple "chime" then the flashing folder with a question mark. Have tried all the standard procedures, ie. reset PRam, try to reboot i safe mode, single use mode etc... to no avail. I can reboot from the install drive. When I go to disk utilities my System Hard Drive shows up, passes Repair Disk Permissions as well as Repair Disk. I can even go into Images>Scan Image for Restore and see all the files on my HD are still there - Documents, Photos, Apps, Desktop, Music. It shows how many folders and files there are. I can aslo go into System Profiler from the startup disk and the HD structure seems fine. So, I don't believe I have a catastrophic HD failure, but something else with hardware etc... Is there a ROM chip on a Mac that holds boot info similar to a Windows machine that has a BIOS chip? IF so, has anyone heard of these going bad? I am not a hardware guru, but it seems it is not reading the startup files. So, I reinstalled the system using Archive my data and it still will not boot. I really need to save the data off this HD. It is under warranty. Thanks for help and suggestions.