At some time or another as computer owners, we may all experience motherboard problems, and feel that we need a motherboard replacement. Issues such as booting problems, and general computer instability can be caused by a fault in your motherboard’s BIOS.
See…the BIOS of a PC software is built into the PC, and is the first code run by a PC when powered on. The primary function of the BIOS is to enable your computer to start and load the operating system. The BIOS initializes and identifies system devices such as the video card, Keyboard and mouse, Hard Drive, CD/DVD drive, and other hardware.
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BIOS software is stored on a ROM chip, on the mother board and thus many hardware related computer problems can be troubleshooted by first “Clearing the CMOS.” Clearing the CMOS will restore the default settings in all BIOS menus. Clearing the CMOS won’t however; restore the original BIOS version (such as in the event of a failed BIOS update).
Signs that you may need to clear CMOS on your computer are:
1.) You made changes to the BIOS settings and now your computer won’t boot or is unstable.
2.) You want to make BIOS changes but you can’t remember your system password, and the system has “locked” you out.
3.) Your Windows clock, date and time are incorrect and change frequently without you making the changes.
4.) Your BIOS settings have become “corrupted” and either won’t save your preferences, or won’t allow you to return the BIOS back to “default settings.”
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Follow these instructions to troubleshoot your particular issues!
1.) Disconnect the power by either shutting off the power switch on the back of your power supply or by removing the power cable entirely from the computer.
2.) Allow the power supply and transistors in the motherboard to discharge; give it a minute or so. You can also (press and hold) the power button several times on the computer case, which will drain the stored power.
3.) Move the CMOS jumper to the “clear” position. This is mostly done by moving the jumper from the original “1-2 position”, to “2-3 position” as demonstrated in the photo below.
If you can’t locate the jumper on your motherboard, you may need to refer to your motherboard manual.
4.) Return the CMOS jumper to it’s original position, after waiting approximately 30 seconds.
5.) Plug your power cord back into the computer and power it on!
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Hopefully the changes work and your problem is solved! If not, we’ve probably already addressed your issue in one of the articles on our website. Feel free to subscribe to this blog for more, regularly updated- technology tips and tricks!
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Happy Computing!
Jarvis Edwards – TekTime IT Consulting & Computer Repair
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Great info! How do I find this cmos on my laptop?
Hi Sue,
You have two options with laptops:
1.) Disassembling the laptop entirely, to find the CMOS battery and either pull it, or pull the cord that connects it to the motherboard–in the event it is attached via cable.
2.) Check your laptop manual – Many laptops have a “switch” underneath that allows resetting of CMOS values.
Feel free to post back if you need any more assistance!
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