Make sure it is completely powering off.
This is common among notebooks and some standard PCs.
If all else fails, use the shut down option, unplug or even remove the battery on notebooks, attempt to power on.
This drains the power supply.
Then reattach the power / power adapter - battery and try the tapping the F8 key again during power up.
See if the Advanced Options page appears.
It is also possible that the restore partition is either missing, damaged or has been repartitioned for extra drive space.
Some virus can infect the boot sector.
If I remember right, Dell also has a BIOS lockout for their business style machines which would have to be re-enabled in BIOS before you can get to the factory reinstall page.