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Description of problem:
I am trying to install redhat linux on a presario 900z laptop.
After having inserted the boot diskette installation reaches window where
decision between cdrom and hard-drive is required. Choosing cdrom results in
"redhat cdrom not found".

Have tried linux hdc=cdrom nodma, hdd=cdrom nodma, hdc=cdrom noautotune,
hdd=cdrom noautotune without success.  

."


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.boot:
2.
3.
	

Additional info:

some of the error messages sent to screen:

."
System message: trying to mount hdc
System log:  hdc:ATAPI reset timed-out, status =0x00
                    ide1 reset timed-out, status=0x00
                    end_request I/O error, dev 16:00 (hdc), sector 0
                    iosfs-read-super bread failed, dev=16:00(hdc), sector 0  
(repeated multiple times)
                      

also tried repeating with hda=cdrom, hdb=cdrom, and hdd=cdrom

In these cases the results were catastrophic with the computer entering an 
unresponsive states with 
following messages directed to the screen:

for hda   hda: status error status = 0x051
             drive ready seek complete error
             hda status error:erro = 0x04
             end_request:I/O error, dev 3:00(hda),sector 0
             unable to handle kernel null points dereference at virtual address 
00000036
             ... stack dump... etc

for hdb hdb:ATAPI reset complete
           hdb:status error status=0x00
           end-request I/O error,dev 03:40(hdb),sector 0
           unable to handle kernel null pointer dereference at virtual address 
00000036
           ...stack dump....

hdd messages were similar to those of hda