Entering the System Setup Program
Turn on (or restart) your computer.
When the blue Dell logo appears, press <Del>.
If you wait too long and the operating system begins to load into memory, let the system complete the load operation. Then shut down the computer and try again.
Clearing NVRAM
To clear NVRAM for all devices and restart the computer:
Enter the system setup program.
Press the right-arrow key to move to the Advanced menu.
Select the Boot Configuration submenu by pressing <Enter>.
Press the down-arrow key to highlight Reset Config Data. Then change the setting to Yes (see Table 3).
Press <F10> to exit the program and restart the computer.
http://support.dell.com/support/trou...=19&l=en&s=dhs
Dell 32 Bit Diagnostics
http://support.dell.com/support/down...37400&vercnt=4
Dell Dimension System BIOS
http://support.dell.com/support/down...5081&vercnt=10