Question about Mercury KVM400M-U Motherboard

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BIOS resetting after overclock failure.

Is there a key that I can press to reset my cmos without opening my PC to short the CMOS Jumper and leave alone the Del Key.

I had seen it on the Mercury Motherboard Manual but I don't have my copy.

Thanks.

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You can Indeed, you simply run a couple of wires to the place you normally reset the bios with the jumper block. Then hook a toggle switch to the other end outside your computer and WALA....PRESTO-CHANGO, you have a resettable BIOS without cracking the case....when you need to reset it, just hit the button and it happens.

Posted on Mar 05, 2009

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I have a dell 3000 dimension desk top computer. The message I get after tapping the F12 key is as follows. Key board failure. Type password and press enter to leave password security enabled next line


The motherboard BIOS is activated when you press the F12 Key and can be locked via a password that is different from your pc user account. There is only one way to reset this because the BIOS is a chip on the motherboard. You have to reset the password using a jumper on the motherboard that is marked with PSWD. This will also clear the CMOS which is Computer Memory on Startup which tells the computer the different changes from the original bios chip. so you may have to go in and set some settings in the bios to have everything back to operational.

Turn off and unplug the tower before opening it.

The password jumper's location on a Dell Dimension motherboard can be found by reviewing the Dimension User Guides.
For most Dell Dimension desktops, the steps to reset a BIOS password and clear all CMOS settings are:
  • Locate the 3-pin CMOS password reset jumper on the system board.
  • Remove the jumper plug from pins 1 and 2.
  • Place the jumper plug on pins 2 and 3 and wait approximately 5 seconds.
  • Replace the jumper plug on pins 1 and 2.
Now replace the panel and plug unit back in. You should be able to enter the bios without a password.

Oct 01, 2014 | Computers & Internet

2 Answers

"Reset you're cmos/bios jumper to


HI,
No need to worry. There are many known ways to reset / remove / bypass the password:
  • By removing the CMOS battery
  • By using the motherboard jumper
  • By using MS DOS command
  • By using software
  • By using Backdoor BIOS password
Now I'll try to explain each method one by one:
A. By Removing the CMOS Battery:
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Almost all motherboards use a small coin sized CMOS battery to store all BIOS settings along with the password. To reset the password, unplug the PC, open the cabinet and remove the CMOS battery for approx. 15-30 minutes and then put it back. It'll reset all BIOS settings as well as the password and you'll need to re-enter all settings.
If it fails, then try to remove the battery for at least one hour.

B. By Using the Motherboard Jumper:
Almost all motherboards contain a jumper that can clear all CMOS settings along with the BIOS password. The location of this jumper varies depending upon the motherboard brand. You should read your motherboard manual to check its location. If you don't have the manual then look for the jumpers near the CMOS battery. Most of the manufacturer label the jumper as CLR, CLEAR, CLEAR CMOS, etc.
When you find the jumper, look carefully. There will be 3 pins and the jumper will be joining the center pin to either left or right pin. What you need to do, is remove the jumper and join the center pin to the opposite pin. e.g. if the jumper joins center pin to left pin, then remove it and join center pin to right pin. Now wait for a few seconds and then again remove the jumper and join the center pin to left pin.
Make sure to turn the PC off before opening the cabinet and resetting the jumper.

C. By Using MS DOS Command:
This method works only if you have access to the system when its turned on because this method requires MS DOS. Open Command Prompt from Programs menu and provide following commands one bye one:
debug
o 70 2E
o 71 FF
quit
NOTE: The first character in the above commands is "O" and not the number 0.
After providing the above commands, restart your system and it should reset the CMOS Settings along with the BIOS password.
If you are curious to know how it works? then let me explain the above commands:
In this method we are using the Debug tool of MS DOS. The "O" character present at first in these commands, outputs the values to IO ports. The number 70 and 71 are port numbers which are used to access CMOS memory. By providing FF value we are telling CMOS that there is an invalid checksum and it resets the CMOS settings as well as BIOS password.

Jan 08, 2011 | Intel DG31PR Motherboard

2 Answers

How can you reset the cmos password


Dell Optiplex 780, user forgot BIOS master password (which is necessary to change the boot order to run BartPE from CD and do an image backup).

There is a jumper on the mainboard called PSWD1, which is set (shorted). Remove power cable from PC (CMOS battery can stay in place), open the lid. Remove jumper from PSWD1. Reconnect power, start the PC, hit F2 to enter BIOS. All passwords should be reset.

Leave BIOS, power off the PC, remove power cable. Reattach jumper to PSWD1, close lid, reattach power cable. Start PC. Enjoy.

Nov 11, 2010 | Dell OptiPlex 780 MT PC Desktop

1 Answer

GA-G1975X OC FAILURE


reset the cmos either using the jumper if it has one or popping the battery out, then redo your bios on boot without overclocking to start then slowly adjust your fsb rebooting each time. if you remember the last setting before it crashed do not go that high. (remember to unplug the power cord before clearing the cmos)

Feb 21, 2010 | Gigabyte GA-G1975X Motherboard

1 Answer

Manual reset motherboard: Soyo SY-K7VME


Bios settings are retained by the Motherboard Battery in the CMOS. Disconnecting the battery clears CMOS and returns the settings to their original state. Typically this can be done by simply removing the CMOS battery and waiting about 15 seconds before reinserting and booting PC. Nowadays most Motherboard manufacturers supply a jumper to not only disconnect the battery but also ground the CMOS to effectively drain any residual power.

The instructions for your MB are found below. JP5 is located to the left of the battery and next to the PCI 2 slot on your MB. There is a Manual for your MB on this site and the MB layout can be found at

http://www.fixya.com/support/p281070-soyo_sy_k7vme_motherboard/manual-35533/page-5

Follow the steps below to clear the CMOS memory.

1. Clear the CMOS memory by momentarily shorting pin 2-3 on jumper JP5. Its white cap can easily identify this jumper.

2. Put the jumper back to 1-2 to allow writing of new data into the CMOS memory.

Jan 07, 2010 | Soyo SY-K7VME Motherboard

2 Answers

Pc "bios"problem


this looks like you have kept the bios password and you forgot it. just do one thing open the cpu case to access the inside of the system and then just remove the battery in it. wait for 5 min and again plug in the battery. thats it your bios memory password will be reset.
2nd solution without removing battery. just reset the bios as shorting the jumper pins. consult your motherboard book to know where to find the bios reset. it will be written as CLEAR CMOS.

Dec 21, 2009 | Intel Computers & Internet

2 Answers

Intel 102ggc:The Firmware has detected that Cmos Checksum Error


Hi there.
Basically you first bios update was bad, if you can get into the operating system re-flash the bios again, that will sort it out.

Good luck and thanks for choosing FixYa!!

Jun 02, 2009 | Microsoft Windows XP Professional Upgrade...

1 Answer

System fail due to cpu overclocking, voice message on reboot, after turning the adaptive overclocking feature on in the bios. I cannot clear cmos and get back into bios to turn it off again. I have tried...


Disconnect the power cable, press and hold the power button. Open the case, remove the cmos battery and short the cmos battery connectors (just touch both the metal tabs center and edge at the same time) with a screwdriver. Replace cmos battery, reconnect the power and power on. This should reset the BIOS to default settings.

Apr 01, 2009 | ASUS A8V Deluxe Motherboard

1 Answer

Chassis intruded!!


Clear RTC RAM (CLRTC)

This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can clear the CMOS memory of date, time, and system setup parameters by erasing the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in CMOS, which include system setup information such as system passwords.
1. Turn OFF the computer and unplug the power cord.
2. Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3 for about 5-10 seconds, then move the cap back to pins 1-2.
3. Plug the power cord and turn ON the computer.
4. Hold down the <Del> key during the boot process and enter BIOS setup to reenter data.

Except when clearing the RTC RAM, never remove the cap on CLRTC jumper default position. Removing the cap will cause system boot failure!If the steps above do not help, remove the onboard battery and move the jumper again to clear the CMOS RTC RAM data. After clearing the CMDS, reinstall the battery.

You do not need to clear the RTC when the system hangs due to overclocking. For system failure due to overclocking, use the CPU Parameter Recall (C.P.R) feature. Shut down and reboot the system so the BIOS can automatically reset parameter settings to default values

Mar 18, 2009 | ASUS P5V800-MX Motherboard

4 Answers

Chassis intruded asus m3a78-cm


I actually did a little research on this one. I downloaded the User Manual for this board. USUALLY, there is a jumper on the board somewhere that needs to be set in the correct position. I looked through the manual and can't find a jumper for this . I even looked through the bios setting just in case it might be covered there, no luck. If you can't find an undocumented jumper on the board somewhere labeled something like TRPWR, then I would try the reset next. My suggestion would be to use the LCRTC jumper to reset the board. Heres the procedure according to page 1-17 of your manual:

Clear RTC RAM (CLRTC)

This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can clear the CMOS memory of date, time, and system setup parameters by erasing the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in CMOS, which include system setup information such as system passwords.
1. Turn OFF the computer and unplug the power cord.
2. Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3 for about 5-10 seconds, then move the cap back to pins 1-2.
3. Plug the power cord and turn ON the computer.
4. Hold down the <Del> key during the boot process and enter BIOS setup to reenter data.

Except when clearing the RTC RAM, never remove the cap on CLRTC jumper default position. Removing the cap will cause system boot failure!If the steps above do not help, remove the onboard battery and move the jumper again to clear the CMOS RTC RAM data. After clearing the CMDS, reinstall the battery.

You do not need to clear the RTC when the system hangs due to overclocking. For system failure due to overclocking, use the CPU Parameter Recall (C.P.R) feature. Shut down and reboot the system so the BIOS can automatically reset parameter settings to default values.

Feb 22, 2009 | Dell Dimension 4600 PC Desktop

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