Following are booting method for your Dell Optiplex 7010 Model: For detailed explanation check Dell OptiPlex 7010 Manual. Following are short term points: Boot mode should be selected as UEFI (Not Legacy) Secure Boot set to Off. ... Go to the 'Boot' tab in the BIOS and select Add Boot option. ( ... A new window will appear with 'blank' boot option name. Name it "CD/DVD/CD-RW Drive" ... Press < F10 > key to save settings and restart. The system will restart.