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Changing the boot sequence is easy. Step by step from Dell.
6. Latitude™ Cp, Cpi, CpiA, CptC, Cpir, CsR, CsxH, CpxH, CptV, CpxJ, or CptS Series Systems
To change the order of your system boot devices, perform the following steps:
NOTE: If your computer is a Dell Latitude CP, CPi series and you have not upgraded your BIOS since you purchased the computer, skip to the bottom of this document for slightly different instructions.
Power on the system.
When the Dell logo screen appears, press the <F2> key or press the <Fn> + <F1> keys simultaneously to enter the BIOS (System Setup).
Press the <Down Arrow> key until Boot First Device is highlighted.
Press the <Right Arrow> key until CD-ROM/DVD-ROM Drive is shown.
Insert CD-ROM you intend to boot to into the CD-ROM drive.
Press the <Alt> + <B> keys at the same time to Save and Reboot.