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P.C. refuses to boot. After 4weeks stopped booting with a check sum bios error. Have cleared cleared RTC RAM . The battery was only showing 1.68 Volt so have changed it. This motherboard (Asus P5KPL-VM) was purchased 14th January 2008, the manual with it is revised edition V2 September 2007.

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  • donita149 Mar 12, 2008

    Have tried that.

  • donita149 Mar 13, 2008

    No, still got a check sum error

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  • 555 Answers

You should re-flash the BIOS on the mobo

Posted on Mar 12, 2008

  • 1 more comment 
  • Matt Jurach
    Matt Jurach Mar 12, 2008

    Get the latest BIOS update (v.0608, released Jan '08) from ASUS.

  • Matt Jurach
    Matt Jurach Mar 12, 2008

    Did the BIOS update successfully?

  • Matt Jurach
    Matt Jurach Mar 13, 2008

    So it sounds like you cannot even access the BIOS? It just immediately reports a checksum error as soon as you power on? No successful POST?

    Clearing the RTC RAM only erases stuff like the date and your custom BIOS setting entries. It doesn't affect the BIOS itself.

    If the BIOS has been corrupted in such a way that you cannot re-flash it, then the entire mobo is, unfortunately, toast.


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Emachine T 5212, when i turn it on,, a siren sounds,,then computer shuts off


In your computer (as well as other gadgets), the battery powers a chip called the Real Time Clock (RTC)chip. The RTC is essentially a quartz watch that runs all the time, whether or not the computer has power. The battery powers this clock. When the computer boots up, part of the process is to query the RTC to get the correct time and date. A little quartz clock like this might run for five to seven years off of a small battery. Then it is time to replace the battery.

This does not explain why your computer would not boot, however. You would expect the computer to boot fine but have an incorrect time and date. The reason your computer would not boot is because the RTC chip also contains 64 (or more) bytes of random access memory (RAM). The clock uses 10 bytes of this space, leaving 54 bytes for other purposes. The BIOS stores all sorts of information in the CMOS RAM area, like the number of floppy and hard disk drives, the hard disk drive type, etc. If the CMOS RAM loses power, the computer may not know anything about the hard disk configuration of your machine, and therefore it cannot boot.

Many more modern computers are not quite so dependent on the CMOS RAM. They store the settings innon-volatile RAM that works without any power at all. If the battery goes dead, the clock fails but the computer can still boot using the information in the non-volatile RAM area. I would change the battery and make sure unit is unplugged and my other hand is touching the metal frame on the computer to stop static discharge. Blow out the inside of the computer completely.Start computer with case off and make sure all the fans run and don't sound like a siren.Replace anything not running.It may not boot if the BIOS can't see the hard drives. You might have to start computer and watch the screen and when it asks you to hit a key to get into like the bios do it and see if you can reset it. If nothing seems be running right maybe the power supply went out they are real cheep at Tiger Direct.

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How do you set the system date and time


To set the Date & Time, go into the BIOS setting - date 7 time.
When you set the Date & Time and you get this error again when you next boot up your computer, then most likely you have a flat BIOS battery.
Then replace this battery, it could be a coin size battery - 3 volt lithium battery type CR2032. and then go into the BIOS setting and set the Date & Time.

Oct 22, 2012 | Gateway Essential 500 PC Desktop

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Hard reset 8650


When you boot up to the log in screen type in administrator as user to log in if you cant log in

during the boot up process you will see on the screen for a short amount of time press a certain key to enter set up press and hold that key during the boot up process to enter BIOS using the arrow keys scroll down to set user password or supervisor password you can change or remove your password from there


The most common way that we know on how to reset or clear the BIOS password is to physically remove the power from the computer by disconnecting the power plug and then removing the Cmos battery for 30 minutes from the motherboard.

Another way is to reset the clear CMOS jumper on the motherboard itself.

Both of the 2 methods mentioned works because most motherboards use a battery to sustain the BIOS/CMOS settings for the motherboards PROM chip. So by cutting off cmos the battery power, the BIOS/CMOS settings will be erased.

cmos battery Under the keyboard or bottom of laptop - If you are working on a laptop computer the location of the dipswitch (almost never a jumper) can be under the keyboard or on the bottom of the laptop in a compartment such as the memory compartment. Although on some motherboards the Cmos battery is soldered in

Often many users will leave the administrator account alone or have other accounts with administrator rights. If you're not logging into the computer as administrator or have other accounts follow the below steps to reset your other accounts password.

Reboot the computer into Safe Mode
During the boot process tap the f8 button three times this will boot into safe mode where the only things working will be your mouse and keyboard enabling you to attempt to repair your computer Advanced Boot Options screen appears.

Select the Safe Mode option using the up and down arrow keys, then press the ENTER key. Choose "Windows XP Home/Professional", depending on the version of the operating system.

Press ENTER. Shortly, the welcome screen should show.
Log in as "Administrator". Click Yes to not use System Restore Mode.


Click the Start button. Choose Run and type in "control user passwords" (without the quotes). Click OK.


Select the "Administrator" user. Click Change my password. Enter a new password in the corresponding text boxes. Click OK. Write this password down and store it in a secure place Close the User Accounts window and restart Windows.


In User Accounts select the account you wish to change the password for, click change password and then enter the new password or click remove the password to remove the password from the account.


If all else fails you may have to clear the BIOS password by resetting the RTC (Real Time Clock) IC (Integrated Circuit) on your motherboard


Many RTC's require an external battery. If your RTC is one of this type you can clear the BIOS password just by unsocketing the RTC and reseating it



Hope it helps

Jul 16, 2012 | PC Desktops

1 Answer

I forgot startup password to a hp xw6200x


When you boot up to the log in screen type in administrator as user to log in if you cant log in

during the boot up process you will see on the screen for a short amount of time press a certain key to enter set up press and hold that key during the boot up process to enter BIOS using the arrow keys scroll down to set user password or supervisor password you can change or remove your password from there


The most common way that we know on how to reset or clear the BIOS password is to physically remove the power from the computer by disconnecting the power plug and then removing the Cmos battery for 30 minutes from the motherboard.

Another way is to reset the clear CMOS jumper on the motherboard itself.

Both of the 2 methods mentioned works because most motherboards use a battery to sustain the BIOS/CMOS settings for the motherboards PROM chip. So by cutting off cmos the battery power, the BIOS/CMOS settings will be erased.

cmos battery Under the keyboard or bottom of laptop - If you are working on a laptop computer the location of the dipswitch (almost never a jumper) can be under the keyboard or on the bottom of the laptop in a compartment such as the memory compartment. Although on some motherboards the Cmos battery is soldered in

Often many users will leave the administrator account alone or have other accounts with administrator rights. If you're not logging into the computer as administrator or have other accounts follow the below steps to reset your other accounts password.

Reboot the computer into Safe Mode
During the boot process tap the f8 button three times this will boot into safe mode where the only things working will be your mouse and keyboard enabling you to attempt to repair your computer Advanced Boot Options screen appears.

Select the Safe Mode option using the up and down arrow keys, then press the ENTER key. Choose "Windows XP Home/Professional", depending on the version of the operating system.

Press ENTER. Shortly, the welcome screen should show.
Log in as "Administrator". Click Yes to not use System Restore Mode.


Click the Start button. Choose Run and type in "control user passwords" (without the quotes). Click OK.


Select the "Administrator" user. Click Change my password. Enter a new password in the corresponding text boxes. Click OK. Write this password down and store it in a secure place Close the User Accounts window and restart Windows.


In User Accounts select the account you wish to change the password for, click change password and then enter the new password or click remove the password to remove the password from the account.


If all else fails you may have to clear the BIOS password by resetting the RTC (Real Time Clock) IC (Integrated Circuit) on your motherboard


Many RTC's require an external battery. If your RTC is one of this type you can clear the BIOS password just by unsocketing the RTC and reseating it



Hope it helps

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1 Answer

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Are you saying you bought 2 more machines to fix the problem? I don't understand. Do you have the manual for the machine. How long did your system run before a Ram stick went bad? What brand and size are your Ram sticks. Are they identicle? As far as Clearing BIOS, your manual should show you the jumper position to do this, which you will leave in this ( drain ) position for a minute. Powering up from here you need to immediately hit a key to send you to BIOS most are <del> or F10 or alt esc. You must look in your manual for this and then all your boards should work. If you need my help in finding your manual, give me all numbers pertaining to your machine.

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1 Answer

LOOK HERE FIRST!!!same deal, went off one day to never reboot. bought a new motherboard after testing everything else and still no boot. STOP DOING THIS!!! I needed to test the ram first, by chance I put...


Remove your battery from the motherboard for 30 sec. Jumper rtc jumper to short. Replace battery after 30 sec. then put RTC jumper back in correct location ( 1-2 or 2-3 ). leave like this another 10 sec then boot again with both Ram sticks. Make sure they are identical.

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1 Answer

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Clear Real Time Clock (RTC) RAM by way of the jumper. This jumper allows you to clear the RTC RAM in CMOS. To clear RTC RAM :
  1. Turn off the computer and unplug the power cord.
  2. Open the chassis.
  3. Remove the on-board battery.
  4. Move the jumper cap from pins 1-2 (default) to pins 2-3 for about 5-10 seconds, then move the cap back to pins 1-2.
  5. Reinstall the battery.
  6. Plug the power cord and turn on the computer.
  7. Hold down the <DEL> key during the boot process and enter BIOS setup to re-enter data.
  8. Start setup again and make sure your setup disc is not corrupted.

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4 Answers

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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

1 Answer

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Your bios defaulted. The battery keeps: date, time, and bios settings. You need to get in your bios and change the settings to what they need to be. You can enter the bios by hitting DEL during boot.

Dec 18, 2008 | PC Desktops

1 Answer

P.C. Motherboard


your best bet is to have it replaced , you only purchased it in January 08, the battery was a fair indication it was not ok

good luck with that
Terry

Mar 12, 2008 | PC Desktops

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