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How to clear cmos? - Compaq Presario 7478 PC Desktop

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Why do you want to do this? It updates itself every time you boot the computer ... based on what it finds when it 'takes attendance'.

If you insist, open the case, find the battery and remove it. Wait 30 seconds and put it back in.

If you do this ... and it doesn't work out ... remember please, I am not encouraging you to do this. There is very little reason to do this, ever!

Thanks for your interest in FixYa.com

Posted on May 30, 2010

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Posted on Jan 02, 2017

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1 Answer

Clear CMOS Jumper JBAT


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Remove the jumper plug from the CMOS jumper (CLEAR CMOS) pins 2 and 3. Place the jumper plug on the CMOS jumper (CLEAR CMOS) pins 1 and 2 and wait approximately five seconds. Remove the jumper plug and replace it on the CMOS jumper (CLEAR CMOS) pins 2 and 3

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Where is the clear bios jumper in my mis k9n6pgm-FI motherboard


JBAT1 is right next to the SATA2 connector.

Clear CMOS Jumper: JBAT1
There is a CMOS RAM on board that has a power from external battery to keep the data of system
configuration. With the CMOS RAM, the system automatically boot OS every time it is turned on. If you
use the JBAT1 (Clear CMOS Jumper) to clear data. Follow the instructions below to clear the
data:

You can clear CMOS by shorting 2-3 pin while the system is off. Then return to 1-2 pin position.
Avoid clearing the CMOS while the system is on; it will damage the mainboard.

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response

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1 Answer

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Try clearing the CMOS --- the down side is your lose all your setting --- the up side is you should be
able to access your BIOS

Clear CMOS Jumper: CLR_CMOS1 ( Located near CMOS battery )
The motherboard uses CMOS RAM to store the basic hardware information (such as BIOS data,
date, time information, hardware password...etc.). Clear CMOS data is the fast way to go back to
factory default when the BIOS settings were mistakenly modified.
The steps to clear CMOS data are :
1. Turn off the computer, unplug the power cord from the power outlet.
2. Remove jumper cap from pins 2-3, put it onto pins 1-2 to short them.
This will clear CMOS data.
3. Return the setting to its original with pins 2-3 closed.
4. Plug in the power cord to your computer and turn it on.
5. Go to BIOS Setup to configure new system as described in next chapter.
Clear Jumper on pins 1 & 2
1 ----
2 ----
3
Normal
(Default)
1
2 ----
3 ----
CLR_CMOS1
  • Disconnect the power cable before adjusting the jumper settings.
  • Do not clear the CMOS while the system is turned on.
WARNING!
Jumper Diagram Definition Description
1-2 Set Pin 1 and Pin 2 closed
2-3 Set Pin 2 and Pin 3 closed

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1 Answer

After cmos save display not coming? when clear


If you have cleared the bios (cmos) at the jumpers....must be off the jumper for at least 1 minute! then your problem is the hard drive, either replace it or reinstall your operating system

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CLR_CMOS (Clearing CMOS Jumper) (next to the battery)

Use this jumper to clear the CMOS values (e.g. date information and BIOS configurations) and
reset the CMOS values to factory defaults. To clear the CMOS values, place a jumper cap on the
two pins to temporarily short the two pins or use a metal object like a screwdriver to touch the two
pins for a few seconds.
• Always turn off your computer and unplug the power cord from the power outlet before
clearing the CMOS values.
• After clearing the CMOS values and before turning on your computer, be sure to remove
the jumper cap from the jumper. Failure to do so may cause damage to the motherboard.
• After system restart, go to BIOS Setup to load factory defaults (select Load Optimized
Defaults) or manually configure the BIOS settings (refer to Chapter 2, "BIOS Setup," for
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1 Answer

How to clear CMOS of a laptop?


On some models, you can unplug the computer, remove the battery and hold the power button for about 15 seconds to clear CMOS.

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1 Answer

Hp d530C/p2.4obc/256E/4 uk


you can clear the cmos by removing the bettery, wait for 10 to 15 seconds then reinstall the battery. you can also clear the cmos by transferring the jumper of cmos clear from your mother board. remove the jumper from pin1-2 then transfer to pin3-4 then return to pin1-2 then power on

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