[CentOS] 6.7 netinstall fails at insert cd to continue

system: hp compact dc7800 dual 64 bit
cd/dvd: oem sata            -- recognized as
                               atapi dvd c dh48c2s  sata5
cd/dvd: lg gp60ns50 usb dvd -- recognized as
                               hl-dt-st dvdram gp60ns50

attempting install using centos 6.7 x86_64 netinstall.

after 'installation method' with 'local cd/dvd' selected, famous
'disc not found' shows.

attempt eject cd with eject button fails. ejecting disc drawer with
paper clip and closing drawer, selecting 'ok' fails again with
'disc not found'.

iirc, there is a way to correct, but do not recall procedure.

advice greatly appreciated.


-- 

peace out.

--
If Bill Gates got a dime for every time Windows crashes...
 ...oh, wait. He does. THAT explains it!
--
in a world with out fences, who needs gates.
--

CentOS GNU/Linux 6.6

tc,hago.

g
.