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In some cases its removing the CMOS battery inside the laptop and powering on with no main battery and no charger connected. Before putting it back together. The CMOS will not only loose the password, but it will also loose its settings including the time and date.
If you can load the laptop otherwise, Toshiba used to offer a windows tool for changing some CMOS options including unconditionally changing the password.
First of all the RTC (real time clock, BIOS/CMOS) battery has run out. This means the computer cannot keep the date and time when its turned off and disconnected from the mains. You will need to take the laptop to a reputable PC repair store and have them fit you a new CMOS battery.
As for the power on problem, this well could relate to the CMOS battery being drained but also could be a number of different reasons why it won't power on properly.
In my experience laptops that have problems powering on is either to do with the DC adapter on the laptop that has a dry solder point or the power board is failing.
Either way i would take the computer to be looked at.
Try this remove the main battery and mains power supply, hit the power switch to drain any retained charge. then remove the cmos battery. The cmos battery is on the right under the
panel at the top of the keyboard, which can be popped out by gently
levering it up at the edges. the key board can then be folded clear,
watch for the ribbon cable under it that connects to the motherboard.no other way i know of. You might want to check this location first get to the cmos battery via the
removable panel on the bottom right front of the case (other side from
the battery). first remove the main battery. next remove the panel,
under it you will see a modem card, remove the modem card and you
should see the cmos battery to the right side its loke a big watch
battery. there will be a connector on the wires going to the battery.
remove this to disconnect it. now just push the start button with the
machine un plugged, just to discharge any residual power. wait a couple
of minutes then reconnect the cmos battery then the modem card, then
the main battery. plug it in and start it up. the screen will come up
with something like "cmos bad checksum, defaults loaded" do not worry
this is normal. if it doesn't start normally, switch it off by holding
the on button down until it goes off then restart. it should be fine
after that, password gone. you can then get into your bios and set it up to your liking. I recommend not putting in a password. Let me know if this works for you. JimmyC
You need a CMOS battery that keeps the time and
start-up state even when the laptop is not plugged in whether the regular battery is working or now.
The CMOS battery is usually a simple watch battery (CR2032) but whatever battery you can probably buy it at rite-aid or radio shack. Google CMOS battery for your laptop type and also look for instructions on how to open up the place where the battery is located.
The memory modules are located at the bottom of the laptop under one of the panels.
The memory modules may be OK and may only need reseating. Then boot up the laptop to see if it works, if it doesn't work, the memory may be faulty, take it to a computer shop to get it tested.
Hi, try this:
- unplug from mains - remove laptop battery - remove real-time clock (CMOS) battery. - wait 5 minutes - replace the RTC battery and then plug in - without the laptop battery. The laptop battery cannot be present when you remove the RTC battery and shouldn't be there when you power on.
Your battery will not charge until it reaches a lower limit of charge.
Whilst in the Laptop and using mains power your battery acts like a UPS and is available soon as you lose power.
The battery life will not be degraded or improved, removing it whilst plugged into mains.
When using Laptop om=n mains the battery is always there in case you lose power or somehow the lead gets pulled out inadvertantly, so you will not lose work.
I use a laptop all the time for work just got a new Latitude D630. The battery in my old lappy is still good for 2hrs+ and never been removed.
80% of its life was on mains.
Hope this helps.
This indicates that the cmos battery is dead and needs replaced. The cmos is located under the main battery, it's in a yellow or greenish pouch with two wires leading to a connector. You'll have to remove the keyboard in order to get to the connector. Replacing the cmos will correct the time and date problem, if it doesn't fix the battery problem, you may need to go to IBM's support site and download the power management driver.
Had the same problem with My Compaq M700 No Boot Or Post. Battery Light Flashes 8 Times, Have to Wait 24 to 48 hrs sometimes longer to get Laptop to Start. Tryed the DC Converter Board Change No Difference same Problem. Noticed When Laptop Did Start Clock Time Was always a Little Off 2-4 Hours sometimes more. So Figure CMOS Problem With Time Issues. Read About Battery Memory Transitor Voltage spike Detection Issues Corrected With Newer Bios Flash at HP Supports. So I Flashed Bios With Latest 686h. During the First Boot After Reflash Battery LED Did flash No Start, After pushing the power button again it Started. And has Every since.So Far Laptop Now Boots Everytime and CMOS Checksum Seems To Keep Time Correct In Windows. The Bios Flash Corrects a Voltage Spike Detecting Transistor In The Charging Circuit. During First Start after flash Bios will run system test on the charging system and Correct CMOS. Worked for Me Hope this Helps a Few.