Hi - my cmos started going funny about a week ago, first it developed a password when I had not set one, then it lost settings so I thought it was a 'flat battery' problem. So I replaced the battery and tried to set up the cmos again. The RTClock will not accept a day number higher than 12 when i try to reset it also at every boot it tells me i have a new cpu installed and to run setup. I can just enter and exit and save without adjusting any setting and the pc will boot. I did suspect maybe a virus or hack attack, but could be just a motherboard problem. What do you all think?
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Web address for the handbook: http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c01041211/c01041211.pdf If the notebook you are servicing has an unknown password, follow these steps to clear the password. These steps also clear CMOS:1. Prepare the notebook for disassembly (refer to Section 4.3, "Miscellaneous Plastics/ Hardware Kit," for more information).2. Remove the real-time clock (RTC) battery (refer toSection 6.24, "RTC Battery," for more information on removing and replacing the RTC battery).3. Wait approximately 5 minutes.4. Replace the RTC battery and reassemble the notebook.5. Connect AC power to the notebook. Do not reinsert any battery packs at this time.6. Turn on the notebook.All passwords and all CMOS settings have been cleared
the RTC battery and leaving it uninstalled for 5 or more minutes causes
all passwords and CMOS settings to be cleared. BIOS
password can be removed by temporarily disconnecting/ removing the RTC/
CMOS (Coin-cell) battery from the motherboard. Disconnect
the coin-cell battery from the system board and it will reset the BIOS
to its default setting and the password would be gone. Please
Refer to Page 29, 106 & 79 of the REPAIR MANUAL IBM T40 for Battery removal, keyboard removal and RTC battery removal instructions. The Backup Battery (RTC, CMOS) is located under the keyboard. So you have to remove the keyboard to access the battery. The above Manual from IBM shows the exact method/ instructions and pictures for laptop dis-assembly for the purpose. If you are comfortable with working inside such electronics, you
can't do it yourself, or else you may seek help from local laptop service
Hope it helps! Good Luck! Thanks for using Fixya! CreativeTECH
1.3 Clearing a Password If the notebook you are servicing has an unknown password, follow these steps to clear the password. These steps also clear CMOS. 1. Prepare the notebook for disassembly (Section 5.3). 2. Remove the real time clock (RTC) battery (Section 5.18). 3. Wait approximately 5 minutes. 4. Replace the RTC battery and reassemble the notebook. 5. Connect AC power to the notebook. Do not reinsert any battery packs at this time. 6. Turn on the notebook. All passwords and all CMOS settings will have been cleared.
Removing the RTC battery and leaving it uninstalled for 5 or more minutes causes all passwords and CMOS settings to be cleared. BIOS
password can be removed by temporarily disconnecting/ removing the RTC/
CMOS (Coin-cell) battery from the motherboard. Disconnect the coin-cell battery from the system board and it will reset the BIOS to its default setting and the password would be gone. Please Refer to Page 77 of the REPAIR MANUAL HP 6720S. If you can't do it yourself, you may seek help from local laptop service professional.
GoodLuck! Dont forget to appreciate the solution if I could have been of any help! CreativeTECH
If this is a BIOS Lockout Password, then you would need to Pull the CMOS battery From the laptop... Which most likely means Complete Disassembly of the laptop just to get to the battery... You would have to unplug the battery... Make sure the Laptops Charging Battery is also Removed and the AC Adapter is NOT plugged in...
Once the CMOS battery is removed, Hold the power button down for 30 seconds... then replace the battery and see if it is bypassed/removed..
There is a good chance that the BIOS password is on a security chip on the motherboard and if this is the case, then pulling the CMOS battery will do you no good... You will need to replace the motherboard if this is the case...
If you cannot access the machine after if has been powered up, it is
still possible to get past the BIOS password. The BIOS password is
stored in CMOS memory that is maintained while the PC is powered off by
a small battery, which is attached to the motherboard.
Open the CPU casing locate the CMOS battery in motherboard and remove
this battery, all CMOS information (including the BIOS password) will
be lost. You will need to re-enter the correct CMOS setup information
to use the machine. The machines owner or user will most likely be
alarmed when it is discovered that the BIOS password has been deleted.
On some motherboards, the battery is soldered to the motherboard,
making it difficult to remove. If this is the case, you have another
alternative. Somewhere on the motherboard you should find a jumper that
will clear the BIOS password. If you have the motherboard
documentation, you will know where that jumper is. If not, the jumper
may be labeled on the motherboard. If you are not fortunate enough for
either of these to be the case, you may be able to guess which jumper
is the correct jumper.
This jumper is usually standing alone near the
battery. If you cannot locate this jumper, you might short both of the
points where the battery connects to the motherboard.
If all else fails, you may have to clear the BIOS password by
resetting the RTC (Real Time Clock) IC (Integrated Circuit) on your
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. Good luck!
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.
1) Remove the computer power pack battery. Remove the keyboard.
2) Remove the RTC battery. Wait 5 minutes. (I would wait longer, maybe 15 minutes.)
3) Reinstall the RTC battery. Reinstall the keyboard.
4) Plug the AC power into the computer. (DO NOT INSTALL THE POWER PACK BATTERY AT THIS POINT)
5) Turn on the computer.
This should reset the password and also all CMOS settings.
You Have to Remove RTC battery ( Cmos ) battery. Wait approximately 5 minutes Replace the RTC battery and reassemble the computer Connect Ac Power to the computer. Do not reinsert any batteries at this time Turn On the computer
all the passwords and all the cmos setting have be cleared.
The only way is to clear the cmos settings. However, there is a special way to do it.
First you have to take out the battery and the power adaptor from the laptop. Then you need to open the laptop and look on the main board for the cmos battery. Take it out for a few minutes, maybe 5 - 10 minutes. Then plug in the power adaptor without the cmos battery nor the laptop battery and boot the computer. It will ask you to hit F1 to either load default values or to save settings. Do that. Then shut down the computer. Make sure settings is saved though. Put in back the cmos battery and the laptop battery. When you reboot, it should boot up with no password.