I'm guessing you have a problem with the Grub bootloader. There are two main types of bootloader in Linux, Lilo and Grub. SUSE uses Grub by default where as Mandriva uses Lilo unless you specify otherwise.
It sounds like the Grub bootloader has been left behind from your old installation and Mandriva has either not installed itself to the MBR properly or has used the original Grub configuration instead of the new one.
Unless you did this before, but re-install wiping the entire drive and make sure (double and tripple check) that Lilo installs itself to the MBR.
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