Hmm check on CPU BIOS setting - if the CPU found your DVDdrive it should be appear on first time boot.
If you have doubt changing setting on your CPU BIOS I guess you should wait for the tech.
If not read thru :
1. During first boot press "DEL" button. This should work unless your PC like those Compaq ones which require a disk or other button pressed to open BIOS setting
2. Check on standard CMOS feature in the BIOS set up
3. To make things easy just set all Primary & Secondary setting into "Auto"
4. Exit to the BIOS set up main menu then select "Save & Exit setup" to close BIOS set up.
5.
Don't change anything or other set up besides these :
Primary master, Pri Slave, Sec. master, Sec. Slave unless you have idea what you're doing.
6. Check if the DVD already show up along with the HDD during first time boot screen.
First time boot screen shoul be like this :
BIOS name (AMI or AWARD)
Total memory counted
Primary HDD type
Primary Slave HDD type
Sec Primary HDD type
Sec Slave HDD type
From your infos the DVD drive should be shown in Sec Slave HDD type.
Hope that helps.
<EDIT>BTW to navigate on BIOS setup screen, check on the bottom of the screen there's some info about which key used to navigate in BIOS set up screen. Most system use arrow keys and to change the setting mostly use Page up or Page Down buttons
