How to enter the mac mini BIOS - Apple MACMINI 266 2X2G 500 SD SYST EOL BUY (885909432639) PC Desktop

You asked this in the Mac Laptops area.
However,
To access the BIOS Setup, turn on the computer and repeatedly press the esc key to enter the Startup Menu, and then press the F10 key to enter the BIOS setup utility.
Figure 1: Example - BIOS Setup Utility
The BIOS Setup window consists of options for Security, System Configuration, and Diagnostics.

All the best to you,
Kerry

Macs do not have a BIOS to enter. The equivalent would be the Extensible Firmware Interface (EFI) to access this (Open Firmware, hence O and F key combination) press Command-Option-O-F keys during startup.

Be careful if and make sure you know exactly what you're doing.

Hope that helps!

Bios screen ? can you be more specific ? Mac does not have a Bios screen. What is it that you need to do ? may be I can help you that way

USB thumb drives give you the ability to mobilize information, but they also have the power to act as a boot disk for both Windows and Mac computers. If you have a bootable thumb drive that you want to boot your computer from, you can easily set it up in the BIOS menu of your Windows computer or through the boot menu in Mac's OSX.

Plug your USB thumb drive into the computer. Boot the computer and follow the on-screen prompt to enter the BIOS (Basic Input/Output System) menu. You should "Press a certain key Usually the DEL or the F2 key to enter BIOS setup" or something similar when you turn your computer on. Follow the directions to enter the BIOS menu. Scroll over to the "Boot" menu in the BIOS screen. Change the primary boot device to USB port or something similar depending on your BIOS menu. Restart the computer with the USB thumb drive in the USB port. b> Mac b> Plug your USB drive into your Mac's USB port. Turn on the computer while holding down the "Option" button on your keyboard. Wait for the boot menu to appear with all of your bootable devices shown. Use the mouse to select your USB thumb drive from the boot menu. Wait for the computer to boot using your thumb drive. Hope this helps.

Remove the cmos battery for 5 - 10 minutes. That will reset all data in the bios.

Locate the BIOS battery and remove it for an hour. Then replace the battery. This should clear the BIOS password.

A lot of people these days appear to be under the impression that Macs have a BIOS, which is unfortunate because they actually have something much better - Macs have OpenFirmware. This is true for G4 Mac Minis, PowerBooks, iBooks, iMacs, eMacs, and Dual G5s…

when you power press F1 or F2 or "del" or F5 or F12
try 1 by 1 to enter in bios.

When you power up the computer press F2 or "del" or F5 or F12 or TAB key to enter in bios.

Thanks for using fixya.
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The MacBook systems use Intel's Extensible Firmware Interface (EFI) rather than the traditional Macintosh ROM or PC BIOS.
So, no such thing as going into the BIOS for advanced setup on Intel Macs (like you can on a PC).