Having trouble getting some dell optiplex 620`s to boot from a zen 7 boot cd,

We are getting this error;
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Loading data into RAM disk (49080 kb)
Linuxrc crashed :-((
Press Enter to Continue
Sorry, linuxrc crashed at address 0x080616c3
Linuxrc has been restarted in manual mode.
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Reading through some old posts it seems to be the phillips drives that is
causing the error.
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Same issue here! It's the Philips DVD-RW/CDRW drives that are causing all
the problems. I have a case open with Novell to see if they can iron this
one out. We're using GX620's. Popping a different drive into the box for
the image pull-down temporarily solves the problem.

Funny thing is, the no-name HL-DataStorage branded drives worked A-OK, but
it's the "name" brand ones (Philips) that are causing all the grief.

Also, By hitting ALT/F3 or ALT/F4 during the time when the boot ISO is
loading data into RAM disk, you can see the log screens that the kernel is
spitting out.
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does any one know how this can be fixed?