I think what you are refering to is the computer bios. Inside
the computer bios, there is an option that allows you to restore
your computer to its default / factory settings.
Different bios and computer makers uses different keys for
accessing bios, so I not exactly sure which key is used for ibm
computers. You can try the following keys when your computer boots
to access your computer bios:
1. DEL
2. ESC
3. F2
4. ALT+F2
5. F1
6. F10
7. F12
Those are some of the common keys used to access bios, there may
also be some other combination keys I do not know of.