Hello, Firstly - I completely understand that this is a situation I have brought upon myself and so have accepted that this may be the end for my laptop. However I would be incredibly grateful if anyone has any ideas. Macbook A1342 (Mid 2010) running Yosemite. Felt the computer wasn't handling Yosemite very well so backed everything up and decided to do a reinstall of Leopard from original DVDs. Inserted install disc, couldn't reinstall normally (by double clicking on icon) so tried booting from disc - no luck. Tried to force boot from disc by changing boot arguments in terminal (yes stupid to play around with I know). Changed the boot argument to boot from disk1s3 which was listed as the install disc. Restarted and no luck, booting status bar taking a long time to move (10mins to reach half way) so used left mouse button and boot to eject disc. When I boot now I get a prohibitory sign (I assume as it can't find the disc I'm pointing it to) but I also can't access any of the boot options such as boot manager, recovery partition, internet recovery. Single user mode also does not work. Most importantly, I can't reset NVRAM by using the Alt + Apple + P + R. What's the verdict, is it dead or is there something else I can try?