First of all you people need to know that my English are not so good and that I'm new to the forum.So be kind..lol. I own an early model Intel mac mini with core 2 duo, 2.0 GHz processor and 2 Gb ram running Leopard snow 10.6.3 to a changed HDD 80Gb 7200 rpm. I've started by making a partition taking half capacity of 80Gb HDD with the boot camp, then ran the ubuntu 9.10 to the new partition. Up to here everything was fine, but when I reboot it the Alt button would not give my any choice of the OS (MAC or LINUX). The Ubuntu was fine but no Mac OS on the mini. Since the HDD was backed up earlier I thought that it would be wise to redo the whole thing from the beginning. So, I've started formatting bit by bit the whole HDD with the Gparted (Linux application). That was it.After what everything wend even worst. A). It would not boot from the HDD (ok. that was expected after formatting practically everything ). A grub error was coming on a black screen. B). Would not boot by a ubuntu cd, at least not strait-away. I had to go through the live cd cause the keyboard was dead (or better not recognized). Not up or down keys and even the enter button was not working. Third. C). And the worst of all, It would not boot from the original Leopard snow cd.No keyboard options again (c, d, or alt button) After all that I've found out that I had a problem to the Master boot record (MBR). So I took the HDD of the mac and reformat it to fat32 on windows pc with a paragon application called partition manager (I think).Then I've fix or delete the MRB (or something like that) with the same application. My next move was to erase and format to HFS journaled the HDD to my other mac by the Disk utility. When I've retry booting I thought all problems would be over. A new message "No bootable device. Insert boot disk an press any key" comes on my black screen every time that I'am powering it up (and try to run a CD). Of course no keyboard is recognized again (for options c, d, or alt). I assuming that another kind of info (something very basic for mac) is been deleted from the mac mini. Also I do not know where would this kind of information it's installed the first time (to the mother-boards chipset? to the Ram? -I doubt it- or the multi-formatted HDD?) Any idea what happened or how can I regain my GREAT Leopard? I'll go crazy without it. Thank you all in advanced, Microcosmos.