I accideantally fdisked my linux hard disk and deleted all partitions, created one single solaris partition.
If you ever ran lilo on a root partition of the disk, then it probably saved a copy of the mbr in the /boot directory which can be manually restored with a disk editor (for example), although I'm not sure about the multiple disk scenario you describe, or about grub.
Furthermore this will only work if you did not repartition the drive after running lilo, but even if you did, at least the root partition at that time should still be recoverable assuming you didn't do anything fancy in the meantime, like resize the root partition with parted.
If all else fails, there are a number of ways to deduce and restore the correct partition table entries, either manually via inspection of the disk contents, or using various automatic recovery tools, or even by trial and error.
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