Difference between revisions of "BIOS Info"
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The initial function of the BIOS is to store the settings that will enable the system to POST (run its Power On Self Test.) | The initial function of the BIOS is to store the settings that will enable the system to POST (run its Power On Self Test.) | ||
| − | BIOS programs are stored on a chip and are built to work with various devices that make up the complementary chipset of the system. They provide a small library of basic input/output functions that can be called to operate and control the peripherals such as the keyboard, text display functions and so forth. | + | BIOS programs are stored on a chip and are built to work with various devices that make up the complementary chipset of the system. They provide a small library of basic input/output functions that can be called to operate and control the peripherals such as the keyboard, text display functions and so forth. |
| − | The keystroke used to enter BIOS depends on the system. Generally, the keys | + | The keystroke used to enter BIOS depends on the system. Generally, the most likely keys are the function keys (F1 - F12) especially F1 and F2 or ESC or DELETE. Often POST or LOGO will display the proper keystroke on the screen, but you might have to have a quick eye to catch it. If you are unable to see the keystroke display, unplug and replug the power supply cable or turn the power supply off and on again to start over and, as soon as the monitor light goes green (or maybe blue), start quickly pressing all the keys listed above and watch the screen for the BIOS to appear. |
| − | + | There is a much more detailed list of keystrokes in the System Eval wiki page titled [[Entering BIOS]] if you would like to study the subject further. | |
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Some computers will prompt you with the option of entering the BIOS on the first boot after a hardware change. Changing the amount of memory may do this, for example. Disconnecting the hard drive cable from the motherboard is another very useful tactic. | Some computers will prompt you with the option of entering the BIOS on the first boot after a hardware change. Changing the amount of memory may do this, for example. Disconnecting the hard drive cable from the motherboard is another very useful tactic. | ||
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=== Rare problems === | === Rare problems === | ||
In some systems, if the keyboard and mouse are switched, they will still work in the GUI, but the keyboard will not work to enter BIOS | In some systems, if the keyboard and mouse are switched, they will still work in the GUI, but the keyboard will not work to enter BIOS | ||
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| + | [[Image:BIOSscreen.png]] | ||
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Revision as of 13:59, 27 March 2009
BIOS - Basic Input/Output System (also known as System BIOS)
The initial function of the BIOS is to store the settings that will enable the system to POST (run its Power On Self Test.)
BIOS programs are stored on a chip and are built to work with various devices that make up the complementary chipset of the system. They provide a small library of basic input/output functions that can be called to operate and control the peripherals such as the keyboard, text display functions and so forth.
The keystroke used to enter BIOS depends on the system. Generally, the most likely keys are the function keys (F1 - F12) especially F1 and F2 or ESC or DELETE. Often POST or LOGO will display the proper keystroke on the screen, but you might have to have a quick eye to catch it. If you are unable to see the keystroke display, unplug and replug the power supply cable or turn the power supply off and on again to start over and, as soon as the monitor light goes green (or maybe blue), start quickly pressing all the keys listed above and watch the screen for the BIOS to appear.
There is a much more detailed list of keystrokes in the System Eval wiki page titled Entering BIOS if you would like to study the subject further.
Some computers will prompt you with the option of entering the BIOS on the first boot after a hardware change. Changing the amount of memory may do this, for example. Disconnecting the hard drive cable from the motherboard is another very useful tactic.
Occasionally you will find a password protected BIOS. In these cases, removing the battery for a minute or two may reset BIOS into a default state, bypassing the password. In the rare cases where there is a default password, these are often available via a google search.
Rare problems
In some systems, if the keyboard and mouse are switched, they will still work in the GUI, but the keyboard will not work to enter BIOS
identify, test, and initialize all the systems I/O devices such as the video display, hard disk, disk drives and other hardware. This is necessary to prepare the machine into a known state, so that software stored on compatible media can be loaded, executed, and given control of the PC.