Hello everyone, I recently bought an old 2008 Imac off a family friend. The Imac has been performing brilliantly for the 2 month's since I bought it, and has succeeded where my old windows laptop failed in enabling me to complete my university coursework. Using programs such as Photoshop, Dreamweaver, etc. However 3 days ago, I was watching something on YouTube and the Imac suffered a Kernel Panic. Being that I am new to owning a Mac I had never experienced, or even heard of a kernel panic before, and so I panicked. Since the kernel panic, the Imac will not boot up. It will switch on, make the chime sound and the apple logo appears as before. But it only gets to roughly 1/3 along the loading bar and just stops. I have researched this problem and have tried everything I think I can try, and at this point I need help, from somebody who knows what they are doing. I have disconnected everything, keyboard, mouse etc, and it made no difference. I have entered safe mode (cmd - s) and entered fsck -fy. The first time I did this it said the Macintosh HD appears to be OK. But just below it says, the volume has been modified. I read that following this response I should type in the same (fsck -fy) which I did. The response comes back the Macintosh HD appears to be OK. I then type in reboot, and it just acts the same. Switches on, chime noise, apple logo, and still only gets to 1/3 along the loading bar. Recovery Mode. I am not able to enter recovery mode by holding down (cmd - R) I can only get the option to enter recovery mode by holding down (alt) on start up. I select recovery-10.10.1 and it goes to the loading bar again, but ultimately will not enter recovery and just freezes at the same point on the loading bar. Safe Boot. I have tried to safe boot by switching the mac on whilst holding down shift, but no luck there either. Verbose mode didn't offer me any clues either, but obviously I don't really know what I'm looking at. I'm new to macs and no tech whizz kid at the best of times, but following my research on the matter, over the last few days, I'm thinking either the HD needs replacing, or I need to perform a fresh install of the OS? I don't even know if it is possible to reinstall the OS when the computer won't boot up? Would disc warrior be wort a try? I would really appreciate some advice on this matter please? If possible I would like to have an idea of whats going on before I tell the person I bought it off. Thanks in advance.