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Biostar A55ML2 Motherboard. Not accepting ram upgrade to 2x8GB DDR3 PC3-12800 1600Mhz.

Jumper settings (JCMOS1: Clear CMOS Header) done. Incompatible RAM? Any motherboard settings/ procedure I need to change/ follow?

Posted by Liam leckie on


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  • 2351 Answers

SOURCE: I changed RAM settings in BIOS, now I can't boot - need to clean CMOS

Pg. 1-15 in your manual. Do both. Clear the cmos by switching jumper to pins 2&3. Make sure the power cord is unpluged. Use a flat head screw driver to help you lift out the battery. Wait a few seconds. Pop the battery back into it's holder & reset the cmos battery back to pins 1&2. Plug the power cord back in. Boot the Pc & press the delete key to enter the bios. If the Pc is beeping remove the memory & reseat. Try another boot up.
Award BIOS Beep Codes: Repeating (endless loop). Check for improperly seated or missing memory. If beep still continue, only place 1 dimm in slot A closest to CPU. Do not forget to unplug power cord before messing with the memory or switch the PSU to off. Wait for the green light on the board to go off.

Posted on Feb 06, 2008



  • 1 Answer

SOURCE: Asus M2N-MX Motherboard 4gb Ram wont work

I had the same problem and ASUS tech support was of no help. I did however find the culpret in the BIOS setup. Go to Advanced, Chipset, NorthBridge Chipset, and Memory Configuration. Set the Bank Interleaving to Disabled and save the settings. Check these settings also while you are there:
Channel Interleaving = Auto
Enable clock to all DIMMS = Disabled
Memory Tristate = Disabled
Memory Hole = Enabled
Unganged Mode = Enabled
Power Down Enable = Enabled
Power Down Mode = Channel
By Wayne F

Posted on Feb 27, 2008



  • 19396 Answers

SOURCE: jumper settings

There is no jumper settings, it is just a small bridge aside the bios Chip. you bridge the two pins and power to reset cmos.

A much easier way is removing the Cmos coin shaped battery from motherboar for few seconds, and put it back, this will reset Cmos the same .

Posted on Oct 10, 2008


Chris Hingee

  • 32281 Answers

SOURCE: Where is Cmos Clear jumper on motherboard to clear Bios password.

If you can't find the jumper, just remove the CMOS battery wait for 1/2 + hour and the re-insert the battery. This will reset the BIOS back to the default settings and you then need to set the Time & Date.
It may not remove the BIOS password if the laptop stores the password on an EEPROM chip.

Posted on Apr 17, 2009


  • 4 Answers

SOURCE: Quanta 30B9 motherboard upgrade to > 2GB ram 64bit OS

Yes that series will accept 4 GB of 2 x 2GB, as I am running a DV9005US with that config on Windows 7 64 bit.

Posted on Feb 20, 2010

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Remove bios password

On the computer motherboard locate the BIOS clear or password jumper or dip switch and change its position. This jumper is often labeled CLEAR, CLEAR CMOS, JCMOS1, CLR, CLRPWD, PASSWD, PASSWORD, PSWD or PWD. To clear, remove the jumper from the two pins currently covers the replace it over the other two.

How to clear an unknown BIOS or CMOS password

How to Reset BIOS Password

Lost BIOS password Resetting the BIOS

Dec 18, 2015 | Computers & Internet

1 Answer

Onboard video on Biostar P4M80-M7A V7.X P4M80-M7A

Go into BIOS Setup, set the graphics to OnBoard.

Biostar Support > P4M80-M7A Version 7.X mobo > Main Support page,


To the upper right is the - Product Support - heading in a purple banner.

Click on the purple - Manual - in the list underneath.
Under the second purple subheading - Docs - (Documents), click on
p4m80-m7.pdf in Red.

[ Ignore if you are aware;
This is a PDF file. The computer you are using now has Adobe Reader on it; which uses PDF files.

After you click on the above file name it may take up to 30 seconds, before the first page comes up.
(The file is downloading in the background, and you will be looking at a blank page until it fully downloads.

Hover your mouse cursor at the Bottom/Middle of the page.
The ghosted out navigation guide will appear.
Go to the far right, and click on the Adobe PDF icon.
When you hover your mouse cursor over it, - Show Adobe Reader tool bar - will briefly appear.

Use the Zoom Out icon ( - ) at the top to decrease the view size.
Use the Zoom In icon ( + ) to increase the view size.

You can use the Down Arrow to go page by page, to the page you want;
If you know the page you want you can do this;
1) Put your mouse cursor in the Adobe Reader page number box.
(Box to the right of the Down Arrow.

2) Left-click once. (Anything in the Adobe Reader page number box, is now highlighted in Blue)

3) Type the page number you want.
4) Press the Enter key

The Adobe Reader page number, and the actual manual page number, are NOT the same ]

Page 9 FOR the actual manual page - Motherboard Layout
The Clear CMOS jumper is right above the Front Panel header.
(Clear CMOS Jumper = M; JCMOS1
Front Panel header = L; JPANEL1

Clear CMOS procedures - Page 16. (Actual manual page)

Wonderful manual (?)
Doesn't give BIOS Setup info. I don't see a separate manual listed for it, either.


I'm going to need your eyes to look into BIOS Setup for me.

Use the Clear CMOS jumper, and procedures, then if it doesn't work post back in a Comment.


{Not only will it clear CMOS Error Codes, but it will also set BIOS Setup back to the factory default settings.
One of which is the motherboard is set to use it's OnBoard Graphics.
(Integrated Graphics)


Dec 22, 2012 | Biostar Computers & Internet

1 Answer


You need to open up your computer to access inside.
By this process,please be warned of potential ESD [Electro Static Discharge].
On the computer motherboard locate the BIOS clear/Password jumper or Dipswitch and change its position.Its mostly located on the edges of the motherboard,by the CMOS battery or even by the processor.
Its currently fixed on two pins 1 & 2 a third pin is not covered.
Now remove it and fix it on pins 2 & 3 leaving pin 1 uncovered.
Turn on the computer let it load and the password is cleared.
Turn it off.Re-fix the Jumper to its original position i.e.on pin 1 & 2.
Turn your machine on now.
Remove the CMOS battery [a round 3v Lithium battery on the motherboard] for like 15 minutes.This makes the system to loose all CMOS settings including the password.

Hope this helps.Thanks!

Mar 05, 2012 | Dell Computers & Internet

1 Answer

BIOS password

Take out the battery from your motherboard, or if that doesn't work locate the BIOS clear / password jumper and change its position. This jumper is often labeled CLEAR, CLEAR CMOS, JCMOS1, CLR, CLRPWD, PASSWD, PASSWORD, PSWD or PWD. Once this jumper has been changed, turn on the computer and the password should be cleared. Once cleared, turn the computer off and return the jumper or dipswitch to its original position.

Aug 31, 2011 | Toshiba TOS SB G15-AV501 FNMSY1...

1 Answer

Where is the Bios reset switch on my... Biostar TA780G M2+ Socket AM2+/ AMD 780G/ DDR2/ A&V&GbE/ MATX Motherboard

Based on the layout below, the jumper to reset your BIOS is to the left of the SATA connectors. It should be markes JCMOS1.


Follow these procedures to clear the CMOS data :
1. Remove AC power line.
2. Set the jumper to "Pin 2-3".
3. Wait for at least five seconds.
4. Set the jumper to "Pin 1-2".
5. Power on the AC.

May 12, 2011 | Biostar M2+ Socket AM2+/ AMD 780G/ DDR2/...

1 Answer

I need to clear the password of the bios. For some reason is locked now. After 3 attempts I've got a Key:65409952

For a Desktop computer:

When inside the computer be sure you're aware of the potential damage that can be caused by ESD.


1. On the computer motherboard locate the BIOS clear / password jumper or dipswitch and change its position. This jumper is often labeled CLEAR, CLEAR CMOS, JCMOS1, CLR, CLRPWD, PASSWD, PASSWORD, PSWD or PWD as shown in the picture to the right. To change the jumper remove it from the two pins its currently on so that it covers the pin that is not covered. For example, in the picture to the right pins 1 and 2 are covered, you'd remove the jumper and put it on pins 2 and 3.

2. Once this jumper has been changed, turn on the computer and the password should be cleared. Once cleared, turn the computer off and return the jumper or dipswitch to its original position.

The location of the jumpers or dipswitches are dependent on the manufacturer of the computer and motherboard. However, below are some general ideas on where to find it. Remember that most motherboards could have dozens of different jumpers, make sure you're changing the CMOS jumper and not something else. If these general suggestions do not help refer to your motherboard / computer documentation or skip to the next step.

The above instructions are from the following page:

Instructions for a Laptop:

Apr 11, 2011 | Computers & Internet

2 Answers

I lost acer 4520 phoenix set up bios password and i search at search bios password and click bios faq where is maybe the only way for fix it. so,i wondering if i can boot with a cd or looking...

try the from the support people or where you bought it they should reset the password but there backdoor password for bios if you want to try any. of them

Mar 30, 2009 | Acer Aspire 4520-5582 Notebook

1 Answer

Integrated graphic controller in p4msd-800

Hi a_car, I understand your trouble. Mach Speed shows little information about the bios settings. The fastest way to get the bios to load the onboard graphics would be to clear the cmos jumper. This is shown on page 12. JCMOS1: Clear CMOS Header. Do not forget to set the jumper back to normal. If this fails to load the onboard graphics card I'll try & guide you from memory.
Enter the bios. Go to the title Advanced. Within advanced menu look for, advanced chipset features & integrated peripherals. One or both should list the settings you want to change too. When using the onboard graphics card, you will also need to set the total amount of system memory you want the graphics to use.

Good luck a_car!
Thank you for using fixya.
Merry xmiss!

Dec 17, 2008 | Mach Speed Matrix P4MSD-800 (P4MSD-800 D2)...

1 Answer

Singlle long beep on booting up my Biostar M7NCDPro motherboard with nothing on screen

If you get one continuous beep (Long and Non-Stop)
This could happen if:
1. The Power supply is damaged or bad.
2. The BIOS is corrupted. Try resetting the CMOS using JCMOS1 jumper on the motherboard or remove the battery from the motherboard for 20 minutes. At this point the first thing to try is a different Power Supply to see if the result is better. If the same problem happens with the new power supply, you may need to send the BIOS Chip to local dealer for reprogramming.

If you get one long High Pitched tone that does not stop until you disconnect the power supply:

1. Check if the CPU fan is connected to the JCFAN1 connector.
2. The CPU might be overheated. Change the CPU FAN or check if the CPU fan has proper contact with the CPU. Refer to your manual for CPU installation.
3. Clear CMOS battery (JCMOS1), be sure to set JCMOS1 back to 1-2 position. (See Quick start guide/ user manual for more info on how to clear the CMOS)
4. Make sure the power supply you have on your system supports the M/B specification. Example. If you have a P4 M/B, you need to use an ATX v2.03 specification power supply. (power supply that has an extra 4-pin square connector)

Sep 15, 2008 | Computers & Internet

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