15 : File not found
This error is returned if the specified file name cannot be found,
but everything else (like the disk/partition info) is OK.
Info available on the error codes in Konqueror atinfo:/grub/Stage2 errors
So whatever command you are using is pointing either to a non-existent file or pointing to the wrong place for an existing file.
something to do with the same hd0,0 error I get after the grub error message
It possibly does ...... but I have not seen it and you have not quoted it, so I could not even guess.
What error ....... the EXACT phrase of the error please.
What is the boot stanza you are using to try to boot PM?
Copy & paste it please from your menu.lst file ........ copy and paste ..... not type it out again .....
My suspicion is that you are attempting to boot the wrong partition ........ supplying sufficient info should allow that to be determined.
what makes it a bootable partion ?
Partitions are not 'bootable'.
The drive is bootable by writing a boot manager, such as Grub, to the MBR.
You list - in the Grub menu.lst file - the details of the OS and its location so that Grub can find it and hand over to it to boot the OS.