HP uses F12, Lenovo has a blue button. It is either certain Fn key, or Ctrl+Fn key combo.
Google it and said Ctrl+F11, F8 etc. Try them all and see which one works.
Recovery partitions
In recent years, bundled recovery CD-ROMs have become less common, as some OEM's are now utilizing hard drive partitions to store the recovery data. Accessing hard drive based system recovery is usually performed by pressing a specific key combination during or after the computer's POST. An example of this was Dell's certain recovery procedure, which involved pressing F11 on the keyboard after POST on a program which was built into the Master Boot Record. Partition based recovery systems are usually faster than their disc based counterparts since the data is directly on the hard drive and no disc swapping is needed. They can also be cheaper for the OEM because they do not need to ship recovery CDs with the computer, adding the price of creating them to the cost of the computer.
