^^I think you may have done it wrong. Refer to this link. Do not press CTRL and F11 at the same time. Press CTRL then F11 then release both.
http://support.dell.com/support/top...2F4C3BED4D0611DC944063B3873AC78A&docid=181316
Note one of the memos says this
Turn on the computer.
When the Dell splash screen appears during the computer startup process, press and hold the <Ctrl> key, and then press the <F11> key. Then, release both keys at the same time.
NOTE: Press the <Ctrl> key and the <F11> key one time only. If these keys are pressed more than one time, a keyboard error may occur. If this problem occurs, repeat steps 3 and 4.
http://support.dell.com/support/top...2F4C3BED4D0611DC944063B3873AC78A&docid=181316
Note one of the memos says this
Turn on the computer.
When the Dell splash screen appears during the computer startup process, press and hold the <Ctrl> key, and then press the <F11> key. Then, release both keys at the same time.
NOTE: Press the <Ctrl> key and the <F11> key one time only. If these keys are pressed more than one time, a keyboard error may occur. If this problem occurs, repeat steps 3 and 4.
