Acer Aspire computers, like all others, permit the user to enter what is termed "BIOS setup." BIOS stands for "basic input/output system" and this is standard on every computer, whether PC or laptop. The BIOS allows the owner to set the date, time, disk bootup order and other settings which may be relevant only for that particular machine. On most systems, the setup screen can only be accessed by pressing a combination of keys immediately after pressing the "Power" button. For Acer computers, there are two different methods for accessing the BIOS setup, and which you must use depends on the age and the model of your Acer Aspire.
Consult your computer owner's manual, if you have it available, and look to see if the precise key combination needed for BIOS setup access is found there. If you don't have your manual, proceed to the following steps.
Ensure that your computer is turned off completely, then turn it back on by pressing the power button to the "On" position. Within the first 10 seconds, press the "Control" key and hold it without letting up. Then press the "Alt" key and hold it also without letting up. Finally, press the "Esc" key and hold it without letting up. You should be pressing and holding all three buttons down at the same time. Hold them for about two seconds and then release them. If your system is an older Acer Aspire model, you should then see the BIOS setup screen. If not, your system is of the newer Aspire model and you should continue to the following step.
Shut down your computer again completely. Once it has been turned off, press the power button to the "On" position to restart the system. Within the first 10 seconds, press down and hold the F2 button for about three seconds and then release it. Within five to 10 seconds after pressing and holding this button, you should see the BIOS setup screen on the monitor.