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How to Replace the CMOS Battery

The majority of issues with a Windows or Linux PC can be resolved by tweaking the operating system, changing settings or (in the case of Windows) installing some updates. However, there is one particularly frustrating issue that can only be resolved by replacing a component.

If you've ever booted up your PC or laptop and discovered that the time has reset to January 1st, 1980, then the time has come to replace the CMOS battery. This small component is basically a wristwatch battery, and its purpose is pretty much identical – it lets your computer tell the time.

This is important for several reasons, not least because your computer needs to know the time when sending emails, logging onto remote file servers and even for scheduled tasks such as anti-virus scans and backups. Brand new Dell Inspiron E1505 Battery for inspiron e1505 laptop.

In the old days of computing, the CMOS battery also stored your BIOS settings. This is no longer the case, however, although you will need to reset the clock to the correct date and time after replacing the component.

Replacing the CMOS Battery

Depending on what type of computer you have, replacing the CMOS battery should be pretty straightforward. Note, however, that this isn't always the case. High quality COMPAQ Presario V6000 Battery for presario v6000 compaq laptop.

For desktops, replacing the component is easiest. All you need to do is unplug the computer, remove the side of the case to present access to the motherboard and, assuming you have taken the necessary anti-static precautions, using a small flat-edged screwdriver prize the battery from its compartment, usually found to the right of the PCI/PCI-e slots. You should insert a replacement battery straightaway and then replace the cover to continue booting your PC.

With laptops and netbooks, however, the problem is a little more complicated. The issue here is that there are so many different form factors and chassis types for laptops that even getting to the battery can be difficult, and this is before discovering that laptop motherboards differ wildly from manufacturer. Replacement HP Pavilion ZD7000 Battery for pavilion zd7000 laptop.

If you have to replace the CMOS battery on a laptop, take the same anti-static precautions as you would when opening a PC but spend some time on the web first of all looking into how your laptop can be opened and the battery found and replaced.

Reconfiguring Your CMOS Settings

Once the battery has been swapped with a new, fully charged replacement, you can then go about the task of setting the correct system time on your computer. There are two ways of doing this, either via the BIOS (typically entered by tapping the DEL key as your computer starts) or in the operating system.

Whichever method you choose, the new CMOS battery should retain the new time and date settings the next time the computer restarts. If this doesn't happen, however, then you likely have a faulty battery or an issue with the motherboard, which will require further investigation and possibly even a replacement.

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Do I have a faulty Cpu?

I bought an OEM E6600CPU and thermal paste to upgrade from an E6300. I know my board supports the chip as I spoke to HP/Compaq. When fitted the PC Bios recongnises the new cpu and goes through the bios start up fine. As soon as the pc starts to load the O/S the PC freezes or resets. I tried this chip in two other machines which run similar cpu's and exactly the same thing happens. What I don't understand is if the chip is faulty how come each machine posts ok until the moment the HDD or DVD is accessed. By the way the three machines the chip has been tried on all have a different O/S. When I put the old chips back in each machine works fine.
Some advice would be appreciated as I don't want to be made to look silly if I take the CPU back.
I cannot start in safe mode as pressing F8 either locks or resets the machines.

have you tried starting in safe mode? I think you tap F8 while the computer is booting.

If it doesn't start in safe mode, then it must be hardware, since I am assuming your PC worked fine prior to the new CPU.

Good Luck

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