I'm having the same problem here, thought I'd give all the information I could find on my share of it.
I've tried with both Mandrake 9.0 and 9.2, both burned directly from ISO images. I know I've done it right because I've booted both sets successfully on another computer (a PIII 450, CD booting from a Plextor CD-RW PX-W1610A).
I've tried with two different i586s (one 133 Mhz and one 200 Mhz), two different motherboards. I've had to use the same CD-ROM (ATAPI, Creative 24x, identified as a CD-2422E during mandrake install) drive on both machines because it's the only one I've got to spare, so I'm not sure yet if it's the culprit.
However, neither will boot the CD, and when trying to bypass the problem with a boot floppy, I'm either told there's no CD to be found, or it's not a Mandrake install CD. Hitting Alt+F3 to look at the console messages displays this:
"
looking for DAC960
mounting /dev/hdd on /tmp/image as iso9660
had to insmod iso9660
insmod iso9660 success
mount failed: not a directory
"
and (Alt+F4) kernel messages:
"
<4> mounted root (ext2 filesystem)
<4> HDD: attached IDE CD-ROM driver
<4> HDD: ATAPI 20X CD-ROM DRIVE, 0 kb cache DM1
<6> UNIFORM CD-ROM DRIVER rev 3.12
<6> end_request: IO error, cmd0 dev 16:40 (hdd), sector 148
<4> unable to read i-node block
<6> end_request: IO error, cmd0 dev 16:40 (hdd), sector 148
<4> unable to read i-node block
"
On one of the two computers on which I tried in vain, I could use the old Mandrake 8.2 CD normally, even boot and install from it. The problem is entirely with the newer CDs
I hope this is of use to someone who knows how to fix it, I'm dying without a system here