r u sure the cd's r still good?
usually there is a 'media check' at boot time, use it if so.
i mean, if you got as far as a boot splash, it sounds like it is either your media (ie cd) or mandy is having problems finding your drive (which is weird since it 'found it' to splash the boot scr).
find out what the drive is actually called (at that point) and enter it at the boot screen (there should be speciall 'boot' instructions before the installer starts.
single cd drives are called various things like: /dev/hdc , /dev/cdrom , /dev/cdrom0 , /dev/cdrom1 ... so your single drive can be anyone of those (don't ask me why!)
i'm not sure how you would find out exactly which of these it is called.. but you can try opening up another console (alt f1 or alt f2-7 depending on which one is 'free') and type: mount .. this may tell you what your drive is being called by the sys.
good luck, lettuce know