Can you please tell me where the CMOS battery is located
Unplug everything from the laptop, remove the battery from the back and hold the power button for 30 seconds. On most computers, this will reset the cmos without needing to remove the cmos battery.
SOURCE: acer 5610z need to locate cmos battery for bios password reset
If you have forgotten your BIOS or system password, there are no software tricks or magical gimmicks that will get the password cleared. Laptops are different in that they are designed to not work with “backdoors” etc. for security reasons. There is one true way that works most of the time and that is hardware.
The Cmos (RTC) battery that is mounted on the motherboard in most cases holds the key, if your motherboard has the battery that is connected to the motherboard by using a two wire socket that plugs into the MOBO, then here is the procedure.
On the motherboard where the battery plugs into, you will see two pins sticking straight up, these engage the plug on the battery side. These two pins have to be “shorted” and then the motherboard powered up for approx. 30 seconds, then power down the system and replace the Cmos battery and reboot. Your password problem should be cleared up. The best way to “short” the pins is get another cmos battery and cut the wires from the battery part, bare the ends and twist together, this will short the pins. Make sure you tape the connection good on the jumper you just made….don’t want to touch anything else with powered up bare wires. Below is the link to your service manual that will point everything out to you. Good luck.
http://tim.id.au/laptops/acer/aspire%205610%20travelmate%204200.pdf
SOURCE: cmos battery on dell inspiron 4100 model PP01L
Reserve Battery
Removing the Reserve Battery
NOTICE: The reserve battery provides power to the computer's RTC and
NVRAM when the computer is turned off. Removing the battery causes the
computer to lose the date and time information as well as all user-specified
parameters in the BIOS. If possible, make a copy of this information before
you remove the reserve battery.
NOTICE: Disconnect the computer and any attached devices from electrical
outlets, and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or
by touching an unpainted metal surface on the computer.
NOTICE: Read "Preparing to Work Inside the Computer" before performing
the following procedure.
1
reserve battery
2
speaker connector
3
system board connector
4
reserve battery cable
Replacing the Reserve Battery
this information was found on the following page which might be useful to you in the future.
http://support.dell.com/support/edocs/systems/ins4100/en/sm_en/remove.htm#1090379
SOURCE: Dell C610 battery cmos/bios
The removal and replacement instructions can be found in the dell service documents available at support.dell.com. You can look it up by service tag or model number. But in short, the procedures are. 1. Remove the hard drive, then remove the keyboard. The keyboard is removed by removing the 5 screws on the bottom of the laptop marked with a "K" beside them. Then the keyboard can be removed. be careful not to tear the ribbon cable, and you do not have to remove the ribbon cable. The battery will be in the center of the opening, it will have a white plug that plugs into the keyboard. Contrary to Ayyasam's recomendations above, it is not necessary to remove "all" the screws on the bottom, nor is it necessary to remove the bottom of the laptop. It should be a 5 minute project. Again for any Dell item, the factory repair manuals are available online, and have exact instructions including pictures and diagrams.
Happy Computing
Daver56
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